Name_____________________________________________________ Date______________ Two-Dimensional Figures Line segment: ______________________ A line segment is a part of a line. It has a beginning and an end, and it is straight. Angle: vertex vertex An angle is formed by two lines or two line segments that cross each other. The point where these two line segments cross is called a vertex. All angles have a vertex. Triangle: A triangle is a figure with three sides and three angles. All these figures are triangles. Right angle: A right angle is an angle that is formed by two perpendicular lines crossing. Rectangles and squares and rectangles have four right angles. 1 ©2003 abcteach.com Name_____________________________________________________ Date______________ Closed Figures Closed figures are formed of lines or line segments. Closed figures have no openings. Rectangle: A rectangle is a figure with four sides and four right angles. Square: A square has four right angles, like a rectangle. Unlike a rectangle, a square has four equal sides. Circle: * A circle is a round figure. All the points on the edge of a circle are the same distance from the center. 2 ©2003 abcteach.com Name_____________________________________________________ Date______________ Polygon: A polygon is closed figure bounded by straight sides. Triangles, rectangles, and squares are polygons. Other polygons: Pentagon (5 sides) Hexagon (six sides) Octagon (8 sides) Some figures are NOT polygons. A circle is not a polygon, because it does not have straight sides. This figure is not a polygon, because it has a rounded side. 3 ©2003 abcteach.com Name_____________________________________________________ Date______________ Polygons 1. Draw a polygon with four sides. 2. Draw a polygon with three sides. 3. Draw a polygon with four right angles. 4. Which figure is NOT a polygon? a. n b. c. d. 5. Which of these figures is not a polygon? a. b. c. d. 6. This is not a polygon. Explain why. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ 4 ©2003 abcteach.com Name_____________________________________________________ Date______________ Angles An angle is formed when two line segments intersect. The point where the two line segments intersect is called the vertex. Vertices are the term for more than one vertex. vertex vertex Polygons have angles. 1. How many angles does this triangle have? ____ How many vertices? ______ 2. How many angles does this rectangle have? _____ How many vertices? ______ 3. How many angles does this pentagon have? ____ How many vertices? ______ 4. Do you see a pattern? Explain. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ Squares and rectangles have square corners. These square corners are called right angles. 5. Look around the room. List some of the right angles you see. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ 5 ©2003 abcteach.com Name_____________________________________________________ Date______________ Squares and Rectangles A rectangle has four sides, four vertices and four right angles. A square is a rectangle with four equal sides. This is a rectangle. This is a square. Look at the picture below. Identify the rectangles. Put an R on the rectangles. Put an S on the squares. Look around the room. List the objects that are rectangles or squares. Rectangles Squares Look at the design. With a colored pencil, put a small square at each right angle. 6 ©2003 abcteach.com Name_____________________________________________________ Date______________ Connect the terms with the matching figure. 1. square a. 2. vertex b. 3. rectangle c. d. 4. pentagon e. 5. triangle f. 6. hexagon g. 7. circle h. 8. right angle i. 9. line segment 10. octagon j. 7 ©2003 abcteach.com Name_____________________________________________________ Date______________ Two-Dimensional Figures T H G I A R T S V G A E U O O G N R S Y I F O S V Y T G V D T O E Q E R A U Q S N E E E B X G C M L D G N C U N R M B Z P A T F G A I G D I T I Y I I A X A K N E U S L E R U G I F D E N U A S S P X L S C T Y O R H G Y I T E E J C F O L W N W S L Y R N F P N R L W L E L S A E Q T T O R J I O Z P C P S E P A H S E G K C L O C Q P A N G L E T E M Y I O J U W R E O D A N U K I O L Y J Y N Y N V Y E R F Q O N E O N R T N E Q C X Z J K P R N G P L Y D ANGLE FIGURE OPEN SIDES CENTER GEOMETRY PENTAGON SQUARE CIRCLE HEXAGON POLYGON STRAIGHT CIRCLE LINE RECTANGLE TRIANGLE CLOSED LINE SEGMENT SHAPE VERTEX 8 ©2003 abcteach.com Name_____________________________________________________ Date______________ Answers Page 4 1. answers will vary 2. answers will vary 3. answers will vary 4. b 5. c 6. This figure is not a polygon because it has a curved edge. Polygons have straight sides. Page 5 1. 3 angles, 3 vertices 2. 4 angles, 4 vertices 3. 5 angles, 5 vertices 4. The number of angles and the number of vertices for a figure are the same. 5. answers will vary Page 6 Assessment is visual Page 7 1. c 2. d 3. f 4. i 5. h 6. e 7. a 8. j 9. b 10. g 9 ©2003 abcteach.com .