Pre-Algebra Demystified

EXAMPLE

Find the area of the parallelogram shown in Fig. 9-12.

SOLUTION

A¼bh

¼ 20 yd32 yd

¼640 yd^2

A trapezoid has a height and two bases
a lower base, b 1 , and an upper
base, b 2 (see Fig. 9-13).

The area of a trapezoid can be found by using the formulaA¼ 21 h(b 1 þb 2 )

CHAPTER 9 Informal Geometry 173

Fig. 9-12.

Fig. 9-13.