Grade 4 - Progress in Mathematics

Solid Figures

11-4

Polygons, or plane figures are flat. They are two-dimensional.

Solid figures are not flat. They are three-dimensional.

A cube is a solid figure with 6 faces,

12 edges, and 8 vertices.

These solid figures have faces, edges,

and vertices.

rectangular prism triangular prism square pyramid

6 faces 5 faces 5 faces

12 edges 9 edges 8 edges

8 vertices 6 vertices 5 vertices

These solid figures have 0 edges and 0 faces.

Each has a curved surface.

cylinder cone sphere

2 flat surfaces 1 flat surface 0 flat surfaces

A face is a flat surface surrounded

by line segments.

Tw o faces meet at a line segment

called an edge.

Three or more edges meet at a vertex.

8204-6_364-365 10/4/07 8:12 AM Page 364