Learning Target: I can compute the surface area of a solid shape by adding areas.

The surface area of a solid figure is the sum of all of the areas of its faces. 

The net, or the "unfolded" solid, can help to determine the faces of a solid figure.

A chart can help organize the areas.

Example

Let's Practice Together

Predict what solid each net will make.  Then, find the surface area of each in square units.

1.

2.

Find the surface area of the solid figure.  Sketch a net or use a chart to help you.

3.

Your Turn

4.

5.

6.

7.

8.

Check for Understanding

1.  Complete the table.

Answers

1.  rectangular solid;  80

2.  cube;  96

3.  208 m²

4.  8.64 dm²

5.  7 ft²

6.  36 cm²

7.  576 cm²

8.  73 ¹/₂ in²

Check for Understanding

1. 
3 cm → 9 cm² → 54 cm²
15 cm → 225 cm² → 1350 cm²