Reteach 10-1 Introduction to Three-Dimensional Figures a Polyhedron Is a Three-Dimensional Figure Whose Faces Are Polygons

Home , Hexagonal prism, Hexagonal pyramid, Octagonal prism, Triangular prism

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LESSON Reteach 10-1 Introduction to Three-Dimensional Figures A polyhedron is a three-dimensional figure whose faces are polygons. There are two types of polyhedrons. Prisms Pyramids

A prism has 2 bases that are congruent A pyramid has one base that is a and parallel polygons. The other faces polygon. Its faces are triangles that are parallelograms or rectangles. meet at one vertex. Prisms and pyramids are named by their bases.

1. Look at the figure at the right.

Its base is a square .

Its faces are triane, . It is called a square pyramid. 2. Look at the figure at the right. It has 2 congruent and parallel bases that are triane, .

Its faces are triane, . It is called a pentagonal prism. If a three-dimensional figure has a face that is curved, it is not a polyhedron.

not a polyhedron

Is each figure a polyhedron? 3. 4. 5.

triane, no triane,

LESSON Practice A LESSON Practice B 10-1 Introduction to Three-Dimensional Figures 10-1 Introduction to Three-Dimensional Figures Identify the base of each prism or pyramid. Then choose the Identify the base or bases of each figure. Then name the figure. name of the prism or pyramid from the box. 1. 2. 3. rectangular prism square pyramid triangular prism pentagonal prism square prism triangular pyramid hexagonal prism rectangular pyramid hexagonal pyramid pentagonal pyramid octagonal prism

1. 2. 3. square, triangle, pentagon, square pyramid triangular pyramid pentagonal prism 4. 5. 6.

triangle, rectangle, square, triangular pyramid rectangular prism square pyramid rectangle, hexagon, octagon, 4. 5. 6. rectangular prism hexagonal pyramid octagonal prism

Classify each figure as a polyhedron or not a polyhedron. Then name the figure. 7. 8. 9.

hexagon, triangle, pentagon, hexagonal prism triangular prism pentagonal pyramid

Classify each figure as a polyhedron or not a polyhedron. polyhedron; not a polyhedron; polyhedron; Then name the figure. hexagonal prism cylinder rectangular pyramid 7. 8. 9. 10. 11. 12.

polyhedron; not a polyhedron; polyhedron; not a polyhedron; polyhedron; polyhedron; triangular prism cone pentagonal pyramid cone octagonal prism rectangular pyramid

LESSON Practice C LESSON Reteach 10-1 Introduction to Three-Dimensional Figures 10-1 Introduction to Three-Dimensional Figures Identify the base or bases of each figure. Then name the figure. A polyhedron is a three-dimensional figure whose faces are polygons. There are two types of polyhedrons. 1. 2. 3. Prisms Pyramids

rectangle, triangle, octagon, A prism has 2 bases that are congruent A pyramid has one base that is a rectangular pyramid triangular prism octagonal prism and parallel polygons. The other faces polygon. Its faces are triangles that are parallelograms or rectangles. meet at one vertex. Classify each figure as a polyhedron or not a polyhedron. Prisms and pyramids are named by their bases. Then name the figure. 4. 5. 6. 1. Look at the figure at the right. Its base is a square .

Its faces are triangles . It is called a square pyramid. 2. Look at the figure at the right. polyhedron; not a polyhedron; polyhedron; It has 2 congruent and parallel bases pentagonal pyramid cone hexagonal prism that are pentagons . Its faces are rectangles . Identify the three-dimensional figure described. It is called a pentagonal prism. 7. three pairs of congruent rectangular sides rectangular prism If a three-dimensional figure has a face that is curved, it is not a polyhedron. 8. square base, four triangular faces square pyramid

not a polyhedron 9. equilateral triangular base, three congruent equilateral triangular faces triangular pyramid Is each figure a polyhedron? 10. two pentagonal bases, five parallelogram faces pentagonal prism 3. 4. 5.

11. two congruent circular bases cylinder

hexagonal pyramid 12. hexagonal base, six triangular faces yes no yes