# 10.6 Three- Dimensional Figures

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10.6 Three- Dimensional Figures
I can name three-dimensional figures

Vocabulary polyhedron cylinder face pyramid edge cone vertex sphere
prism base

A polyhedron is a three-dimensional object with flat surfaces, called faces, that are polygons.
When two faces of a three-dimensional figure share a side, they form an edge. A point at which three or more edges meet is a vertex (plural: vertices).

Identify the number of faces, edges, and vertices on each three-dimensional figure.

Identify the number of faces, edges, and vertices on each three-dimensional figure.

A prism is a polyhedron with two congruent, parallel bases, and other faces that are all parallelograms. A prism is named for the shape of its bases. A cylinder also has two congruent, parallel bases, but bases of a cylinder are circular. A cylinder is not a polyhedron because not every surface is a polygon.

A pyramid has one polygon-shaped base and three or more triangular faces that share a vertex. A pyramid is named for the shape of its base. A cone has a circular base and a curved surface that comes to a point. A sphere has no base and one curved surface. All points on the surface are the same distance from a point called the center of the sphere.

Name the three-dimensional figure
The figure represents a cylinder.

Name the three-dimensional figure represented by the object.
The figure is a rectangular prism.

Name the three-dimensional figure represented by the object.
The figure is a square pyramid.

Lesson Quiz 1. Identify the number of faces, edges, and vertices in the figure shown. Identify the figure described. 2. two congruent circular faces connected by a curved surface 3. one flat circular face and a curved lateral surface that comes to a point 8 faces, 18 edges, and 12 vertices cylinder cone

Lesson Quiz for Student Response Systems
2. Identify the figure described. A square base with four triangles that come to a point. A. square prism B. square pyramid C. rectangular prism D. rectangular pyramid

Lesson Quiz for Student Response Systems
3. Identify the figure described. A hexagonal base with six triangles that come to a point. A. hexagonal prism B. triangular prism C. hexagonal pyramid D. triangular pyramid