Find the Volume of Each Pyramid. 1. SOLUTION: the Volume of A
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Chapter 11. Three Dimensional Analytic Geometry and Vectors
Chapter 11. Three dimensional analytic geometry and vectors. Section 11.5 Quadric surfaces. Curves in R2 : x2 y2 ellipse + =1 a2 b2 x2 y2 hyperbola − =1 a2 b2 parabola y = ax2 or x = by2 A quadric surface is the graph of a second degree equation in three variables. The most general such equation is Ax2 + By2 + Cz2 + Dxy + Exz + F yz + Gx + Hy + Iz + J =0, where A, B, C, ..., J are constants. By translation and rotation the equation can be brought into one of two standard forms Ax2 + By2 + Cz2 + J =0 or Ax2 + By2 + Iz =0 In order to sketch the graph of a quadric surface, it is useful to determine the curves of intersection of the surface with planes parallel to the coordinate planes. These curves are called traces of the surface. Ellipsoids The quadric surface with equation x2 y2 z2 + + =1 a2 b2 c2 is called an ellipsoid because all of its traces are ellipses. 2 1 x y 3 2 1 z ±1 ±2 ±3 ±1 ±2 The six intercepts of the ellipsoid are (±a, 0, 0), (0, ±b, 0), and (0, 0, ±c) and the ellipsoid lies in the box |x| ≤ a, |y| ≤ b, |z| ≤ c Since the ellipsoid involves only even powers of x, y, and z, the ellipsoid is symmetric with respect to each coordinate plane. Example 1. Find the traces of the surface 4x2 +9y2 + 36z2 = 36 1 in the planes x = k, y = k, and z = k. Identify the surface and sketch it. Hyperboloids Hyperboloid of one sheet. The quadric surface with equations x2 y2 z2 1. -
Pentagonal Pyramid
Chapter 9 Surfaces and Solids Copyright © Cengage Learning. All rights reserved. Pyramids, Area, and 9.2 Volume Copyright © Cengage Learning. All rights reserved. Pyramids, Area, and Volume The solids (space figures) shown in Figure 9.14 below are pyramids. In Figure 9.14(a), point A is noncoplanar with square base BCDE. In Figure 9.14(b), F is noncoplanar with its base, GHJ. (a) (b) Figure 9.14 3 Pyramids, Area, and Volume In each space pyramid, the noncoplanar point is joined to each vertex as well as each point of the base. A solid pyramid results when the noncoplanar point is joined both to points on the polygon as well as to points in its interior. Point A is known as the vertex or apex of the square pyramid; likewise, point F is the vertex or apex of the triangular pyramid. The pyramid of Figure 9.14(b) has four triangular faces; for this reason, it is called a tetrahedron. 4 Pyramids, Area, and Volume The pyramid in Figure 9.15 is a pentagonal pyramid. It has vertex K, pentagon LMNPQ for its base, and lateral edges and Although K is called the vertex of the pyramid, there are actually six vertices: K, L, M, N, P, and Q. Figure 9.15 The sides of the base and are base edges. 5 Pyramids, Area, and Volume All lateral faces of a pyramid are triangles; KLM is one of the five lateral faces of the pentagonal pyramid. Including base LMNPQ, this pyramid has a total of six faces. The altitude of the pyramid, of length h, is the line segment from the vertex K perpendicular to the plane of the base. -
Calculus Terminology
AP Calculus BC Calculus Terminology Absolute Convergence Asymptote Continued Sum Absolute Maximum Average Rate of Change Continuous Function Absolute Minimum Average Value of a Function Continuously Differentiable Function Absolutely Convergent Axis of Rotation Converge Acceleration Boundary Value Problem Converge Absolutely Alternating Series Bounded Function Converge Conditionally Alternating Series Remainder Bounded Sequence Convergence Tests Alternating Series Test Bounds of Integration Convergent Sequence Analytic Methods Calculus Convergent Series Annulus Cartesian Form Critical Number Antiderivative of a Function Cavalieri’s Principle Critical Point Approximation by Differentials Center of Mass Formula Critical Value Arc Length of a Curve Centroid Curly d Area below a Curve Chain Rule Curve Area between Curves Comparison Test Curve Sketching Area of an Ellipse Concave Cusp Area of a Parabolic Segment Concave Down Cylindrical Shell Method Area under a Curve Concave Up Decreasing Function Area Using Parametric Equations Conditional Convergence Definite Integral Area Using Polar Coordinates Constant Term Definite Integral Rules Degenerate Divergent Series Function Operations Del Operator e Fundamental Theorem of Calculus Deleted Neighborhood Ellipsoid GLB Derivative End Behavior Global Maximum Derivative of a Power Series Essential Discontinuity Global Minimum Derivative Rules Explicit Differentiation Golden Spiral Difference Quotient Explicit Function Graphic Methods Differentiable Exponential Decay Greatest Lower Bound Differential -
If Two Polygons Are Similar, Then Their Areas Are Proportional to the Square of the Scale Factor SOLUTION: Between Them
Chapter 10 Study Guide and Review State whether each sentence is true or false. If 6. The measure of each radial angle of a regular n-gon false, replace the underlined term to make a is . true sentence. 1. The center of a trapezoid is the perpendicular SOLUTION: distance between the bases. false; central SOLUTION: ANSWER: false; height false; central ANSWER: 7. The apothem of a polygon is the perpendicular false; height distance between any two parallel bases. 2. A slice of pizza is a sector of a circle. SOLUTION: false; height of a parallelogram SOLUTION: true ANSWER: false; height of a parallelogram ANSWER: true 8. The height of a triangle is the length of an altitude drawn to a given base. 3. The center of a regular polygon is the distance from the middle to the circle circumscribed around the SOLUTION: polygon. true SOLUTION: ANSWER: false; radius true ANSWER: 9. Explain how the areas of two similar polygons are false; radius related. 4. The segment from the center of a square to the SOLUTION: corner can be called the radius of the square. If two polygons are similar, then their areas are proportional to the square of the scale factor SOLUTION: between them. true ANSWER: ANSWER: If two polygons are similar, then their areas are true proportional to the square of the scale factor 5. A segment drawn perpendicular to a side of a regular between them. polygon is called an apothem of the polygon. SOLUTION: true ANSWER: true eSolutions Manual - Powered by Cognero Page 1 Chapter 10 Study Guide and Review 10. -
Section 6.2 Introduction to Conics: Parabolas 103
Section 6.2 Introduction to Conics: Parabolas 103 Course Number Section 6.2 Introduction to Conics: Parabolas Instructor Objective: In this lesson you learned how to write the standard form of the equation of a parabola. Date Important Vocabulary Define each term or concept. Directrix A fixed line in the plane from which each point on a parabola is the same distance as the distance from the point to a fixed point in the plane. Focus A fixed point in the plane from which each point on a parabola is the same distance as the distance from the point to a fixed line in the plane. Focal chord A line segment that passes through the focus of a parabola and has endpoints on the parabola. Latus rectum The specific focal chord perpendicular to the axis of a parabola. Tangent A line is tangent to a parabola at a point on the parabola if the line intersects, but does not cross, the parabola at the point. I. Conics (Page 433) What you should learn How to recognize a conic A conic section, or conic, is . the intersection of a plane as the intersection of a and a double-napped cone. plane and a double- napped cone Name the four basic conic sections: circle, ellipse, parabola, and hyperbola. In the formation of the four basic conics, the intersecting plane does not pass through the vertex of the cone. When the plane does pass through the vertex, the resulting figure is a(n) degenerate conic , such as . a point, a line, or a pair of intersecting lines. -
Lesson 7: General Pyramids and Cones and Their Cross-Sections
NYS COMMON CORE MATHEMATICS CURRICULUM Lesson 7 M3 GEOMETRY Lesson 7: General Pyramids and Cones and Their Cross-Sections Student Outcomes . Students understand the definition of a general pyramid and cone and that their respective cross-sections are similar to the base. Students show that if two cones have the same base area and the same height, then cross-sections for the cones the same distance from the vertex have the same area. Lesson Notes In Lesson 7, students examine the relationship between a cross-section and the base of a general cone. Students understand that pyramids and circular cones are subsets of general cones just as prisms and cylinders are subsets of general cylinders. In order to understand why a cross-section is similar to the base, there is discussion regarding a dilation in three dimensions, explaining why a dilation maps a plane to a parallel plane. Then, a more precise argument is made using triangular pyramids; this parallels what is seen in Lesson 6, where students are presented with the intuitive idea of why bases of general cylinders are congruent to cross-sections using the notion of a translation in three dimensions, followed by a more precise argument using a triangular prism and SSS triangle congruence. Finally, students prove the general cone cross-section theorem, which is used later to understand Cavalieri’s principle. Classwork Opening Exercise (3 minutes) The goals of the Opening Exercise remind students of the parent category of general cylinders, how prisms are a subcategory under general cylinders, and how to draw a parallel to figures that “come to a point” (or, they might initially describe these figures); some of the figures that come to a point have polygonal bases, while some have curved bases. -
Apollonius of Pergaconics. Books One - Seven
APOLLONIUS OF PERGACONICS. BOOKS ONE - SEVEN INTRODUCTION A. Apollonius at Perga Apollonius was born at Perga (Περγα) on the Southern coast of Asia Mi- nor, near the modern Turkish city of Bursa. Little is known about his life before he arrived in Alexandria, where he studied. Certain information about Apollonius’ life in Asia Minor can be obtained from his preface to Book 2 of Conics. The name “Apollonius”(Apollonius) means “devoted to Apollo”, similarly to “Artemius” or “Demetrius” meaning “devoted to Artemis or Demeter”. In the mentioned preface Apollonius writes to Eudemus of Pergamum that he sends him one of the books of Conics via his son also named Apollonius. The coincidence shows that this name was traditional in the family, and in all prob- ability Apollonius’ ancestors were priests of Apollo. Asia Minor during many centuries was for Indo-European tribes a bridge to Europe from their pre-fatherland south of the Caspian Sea. The Indo-European nation living in Asia Minor in 2nd and the beginning of the 1st millennia B.C. was usually called Hittites. Hittites are mentioned in the Bible and in Egyptian papyri. A military leader serving under the Biblical king David was the Hittite Uriah. His wife Bath- sheba, after his death, became the wife of king David and the mother of king Solomon. Hittites had a cuneiform writing analogous to the Babylonian one and hi- eroglyphs analogous to Egyptian ones. The Czech historian Bedrich Hrozny (1879-1952) who has deciphered Hittite cuneiform writing had established that the Hittite language belonged to the Western group of Indo-European languages [Hro]. -
Characteristics of Solids
Mathematics Instructional Plan – Grade 4 Characteristics of Solids Strand: Measurement and Geometry Topic: Geometric characteristics of solid figures Primary SOL: 4.11 The student will identify, describe, compare, and contrast plane and solid figures according to their characteristics (number of angles, vertices, edges, and the number and shape of faces) using concrete and pictorial representations. Related SOL: 4.10a, b Materials Set of geometric solid models for students (cube, rectangular prism, square pyramid, sphere, cone, and cylinder) Demonstration set of geometric solids models Nets for Geometric Solids (attached) Real-world objects in the shape of a cube, rectangular prism, square pyramid, sphere, cone, and cylinder. Why Am I Special? activity sheet (attached) Spaghetti Sticky notes or squares of paper What Am I? Matching Cards Shapes (attached) What Am I? Matching Cards Descriptions (attached) Real World Look-a-Like 3-D Shapes handout (attached) Vocabulary angle, attributes, cone, congruent, cube, cylinder, edge, face, parallel, plane figure, rectangular prism, solid figure, sphere, square pyramid, three dimensional, two dimensional, vertex/vertices Student/Teacher Actions: What should students be doing? What should teachers be doing? Note: To support students as they develop an awareness and an understanding of the vocabulary associated with two- and three-dimensional geometric shapes/figures, consider creating a word wall using the geometry related vocabulary cards developed by the Virginia Department of Education. 1. Students will be working in groups of 2–3. To introduce the lesson, provide each student with a set of geometric solids: cube, rectangular prism, square pyramid, sphere, cone, and cylinder. This is a chance to observe and explore the figures, so allow students to work without providing any explanation of the figures, these ideas will be made clear in the remainder of the lesson. -
14. Mathematics for Orbits: Ellipses, Parabolas, Hyperbolas Michael Fowler
14. Mathematics for Orbits: Ellipses, Parabolas, Hyperbolas Michael Fowler Preliminaries: Conic Sections Ellipses, parabolas and hyperbolas can all be generated by cutting a cone with a plane (see diagrams, from Wikimedia Commons). Taking the cone to be xyz222+=, and substituting the z in that equation from the planar equation rp⋅= p, where p is the vector perpendicular to the plane from the origin to the plane, gives a quadratic equation in xy,. This translates into a quadratic equation in the plane—take the line of intersection of the cutting plane with the xy, plane as the y axis in both, then one is related to the other by a scaling xx′ = λ . To identify the conic, diagonalized the form, and look at the coefficients of xy22,. If they are the same sign, it is an ellipse, opposite, a hyperbola. The parabola is the exceptional case where one is zero, the other equates to a linear term. It is instructive to see how an important property of the ellipse follows immediately from this construction. The slanting plane in the figure cuts the cone in an ellipse. Two spheres inside the cone, having circles of contact with the cone CC, ′, are adjusted in size so that they both just touch the plane, at points FF, ′ respectively. It is easy to see that such spheres exist, for example start with a tiny sphere inside the cone near the point, and gradually inflate it, keeping it spherical and touching the cone, until it touches the plane. Now consider a point P on the ellipse. -
Areas of Regular Polygons Finding the Area of an Equilateral Triangle
Areas of Regular Polygons Finding the area of an equilateral triangle The area of any triangle with base length b and height h is given by A = ½bh The following formula for equilateral triangles; however, uses ONLY the side length. Area of an equilateral triangle • The area of an equilateral triangle is one fourth the square of the length of the side times 3 s s A = ¼ s2 s A = ¼ s2 Finding the area of an Equilateral Triangle • Find the area of an equilateral triangle with 8 inch sides. Finding the area of an Equilateral Triangle • Find the area of an equilateral triangle with 8 inch sides. 2 A = ¼ s Area3 of an equilateral Triangle A = ¼ 82 Substitute values. A = ¼ • 64 Simplify. A = • 16 Multiply ¼ times 64. A = 16 Simplify. Using a calculator, the area is about 27.7 square inches. • The apothem is the F height of a triangle A between the center and two consecutive vertices H of the polygon. a E G B • As in the activity, you can find the area o any regular n-gon by dividing D C the polygon into congruent triangles. Hexagon ABCDEF with center G, radius GA, and apothem GH A = Area of 1 triangle • # of triangles F A = ( ½ • apothem • side length s) • # H of sides a G B = ½ • apothem • # of sides • side length s E = ½ • apothem • perimeter of a D C polygon Hexagon ABCDEF with center G, This approach can be used to find radius GA, and the area of any regular polygon. apothem GH Theorem: Area of a Regular Polygon • The area of a regular n-gon with side lengths (s) is half the product of the apothem (a) and the perimeter (P), so The number of congruent triangles formed will be A = ½ aP, or A = ½ a • ns. -
Ellipse, Hyperbola and Their Conjunction Arxiv:1805.02111V2
Ellipse, Hyperbola and Their Conjunction Arkadiusz Kobiera Warsaw University of Technology Abstract This article presents a simple analysis of cones which are used to generate a given conic curve by section by a plane. It was found that if the given curve is an ellipse, then the locus of vertices of the cones is a hyperbola. The hyperbola has foci which coincidence with the ellipse vertices. Similarly, if the given curve is the hyperbola, the locus of vertex of the cones is the ellipse. In the second case, the foci of the ellipse are located in the hyperbola's vertices. These two relationships create a kind of conjunction between the ellipse and the hyperbola which originate from the cones used for generation of these curves. The presented conjunction of the ellipse and hyperbola is a perfect example of mathematical beauty which may be shown by the use of very simple geometry. As in the past the conic curves appear to be arXiv:1805.02111v2 [math.HO] 26 Jan 2019 very interesting and fruitful mathematical beings. 1 Introduction The conical curves are mathematical entities which have been known for thousands years since the first Menaechmus' research around 250 B.C. [2]. Anybody who has attempted undergraduate course of geometry knows that ellipse, hyperbola and parabola are obtained by section of a cone by a plane. Every book dealing with the this subject has a sketch where the cone is sec- tioned by planes at various angles, which produces different kinds of conics. Usually authors start with the cone to produce the conic curve by section. -
Influence of Coal Dust on Premixed Turbulent Methane-Air Flames Scott
Influence of Coal Dust on Premixed Turbulent Methane-Air Flames Scott R. Rockwell A Dissertation Submitted to the Faculty of Worcester Polytechnic Institute In partial fulfillment of the requirements for the Degree of Doctor of Philosophy in Fire Protection Engineering July 2012 APPROVED: _____________________________________________ Professor Ali S. Rangwala, Advisor _____________________________________________ Professor Kathy A. Notarianni, Head of Department _____________________________________________ Professor Simon W. Evans _____________________________________________ Professor Sanjeeva Balasuriya _____________________________________________ Dr. Alfonso F. Ibarreta _____________________________________________ Professor Forman A. Williams Table of Contents Table of Contents ............................................................................................................................ 2 List of figures .................................................................................................................................. 5 List of tables .................................................................................................................................... 6 Nomenclature .................................................................................................................................. 7 Acknowledgments........................................................................................................................... 8 Abstract ..........................................................................................................................................