Lesson 10-6Solid Figures

Review

What is the formula for the circumference of a circle? C=∏d

What is the formula for the area of a circle? A= ∏r

What does ∏ equal? 3.14

Solid Figures

By the end of this lesson you will be able to name solid figures.

Vocabulary

Polyhedron A three dimensional object, or solid figure, with

flat surfaces, called faces, that are polygons. Edge

When two faces of a solid figure share a side Vertex

A point at which three or more edges meet

Practice

How many faces, edges, and vertices does each figure have?

Prisms

A Polyhedron with two congruent, parallel bases, and other faces that are all parallelograms.

A prism is named for the shape of its base.

Cylinders

Has two congruent, parallel bases, but bases of a cylinder are always circular.

Pyramids

Has one polygon shaped base, and the other faces are triangles that come to a point.

A pyramid is named for the shape of its base.

Cones

Has a circular base and a curved surface that comes to a point.