Learn to find the surface areas of solid figures!

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

A net can help to determine the faces of a solid figure.

A chart can help to organize the data.

Guided Practice

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 figures shown.  Sketch a net or use a chart to help you.

3.

4.

5.

6.

7.

8.

9.  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

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