CPM Homework Help : CCG Problem 2-115

A trapezoid with bottom base 18 + 5 feet, top base 12 feet and left side 13 feet. A right triangle is created by a line segment drawn from the upper left vertex perpendicular to the base with the base labeled 5 feet. Find the area of the trapezoid at right. What strategies did you use?

Hint:

Look at the Math Notes box in Lesson 2.2.4 for help.

Step 1:

$\begin{array}{r} 5^2 + c^2 = 13^2 \\ -25 \qquad -25 \end{array}$

Step 2:

$\text{Area of a trapezoid }=\frac{1}{2}(b_{1}+b{_{2}})h$