write an equation for the area, a, of the triangle shown.

Explanation:

Step1: Recall the area formula for a triangle

The area formula for a triangle is (A=\frac{1}{2}\times base\times height).

Step2: Identify the base and height

From the problem, the base (b = 20) ft and the height (h=12) ft.

Step3: Substitute values into the formula

Substitute (b = 20) and (h = 12) into (A=\frac{1}{2}\times b\times h), we get (A=\frac{1}{2}\times12\times20).

Answer:

(A=\frac{1}{2}\times12\times20)