Nets and Surface Area – Draw two-dimensional models for three-dimensional figures. – Find surface area. Designers use wind tunnels to study the shapes of surfaces to design vehicles that are faster and more efficient.

DRAWINGS OF THREE-DIMENSIONAL FIGURES

Isometric Dot Paper

Isometric Graph Paper

SURFACE AREA Nets are very useful in visualizing the polygons that make up the surface of a solid.

Tetrahedron 4 Faces 4 Vertices 6 Edges SURFACE AREA The surface area is the sum of the areas of each face of the solid.

Example 1 Nets and Surface Area Draw a net for the right triangular prism shown h

Example 1 Nets and Surface Area Use the net to find the surface area of the triangular prism.