Answer:
B. 216 in²
Explanation:
You want to know the area of a triangle with a base of 36 inches and a height of 12 inches.
Area formula
The area of a triangle is given by ...
A = 1/2bh
where b is the base of the triangle (one side), and h is the height to the opposite vertex, measured perpendicular to the base.
Application
The figure shows a base of 36 inches and a height of 12 inches. Using these values in the formula, we have ...
A = 1/2(36 in)(12 in) = 216 in²
The area of the triangle is 216 in².