CPM Homework Help : GC Problem 2-71

A rectangle with a shaded triangle inside. The triangle's top vertex starts at the rectangle's upper left corner and the sides extend out to the bottom right corner. The base of the triangle is 7 feet. The remaining side length of the rectangle is 3 feet. The width of the rectangle is 8 feet. The shaded triangle at right is surrounded by a rectangle. Find the area of the triangle.

Hint:

The formula to find the area of a triangle is $\frac{1}{2}(\text{base}\times\text{height})$ .

Answer:

$28$ square units