Question

what is the area? 3 mi 6 mi 10 mi square miles

Explanation:

Step1: Recall trapezoid area formula

The formula for the area of a trapezoid is $A=\frac{(a + b)h}{2}$, where $a$ and $b$ are the lengths of the parallel - sides and $h$ is the height. Here, $a = 3$ mi, $b = 10$ mi, and $h=6$ mi.

Step2: Substitute values into formula

$A=\frac{(3 + 10)\times6}{2}=\frac{13\times6}{2}$.

Step3: Perform calculations

First, calculate $13\times6 = 78$. Then, $\frac{78}{2}=39$.

Answer:

39