Pre-Algebra Demystified

The area of a triangle can be found by using the formulaA¼^12 bh, where b is

the base and h is the height or altitude.

EXAMPLE

Find the area of the triangle shown in Fig. 9-11.

SOLUTION

A¼

1

2

bh

¼

1

2

12 ft16 ft

¼96 ft^2

The area of a parallelogram can be found by using the formula A¼bh, where

b is the base and h is the height or altitude.

172 CHAPTER 9 Informal Geometry

Fig. 9-11.

Fig. 9-10.