#### Answer

A = $\frac{45}{2}$ $ft^{2}$ or 22$\frac{1}{2}$ $ft^{2}$

#### Work Step by Step

A = $\frac{1}{2}$bh
b =15 ft, h = 3 ft
In this formula, b is the length of the base of the triangle and h is the height of the triangle. What is the area if b is 15 ft and h is 3 ft?
A = $\frac{1}{2}$bh
Evaluate the formula by replacing b with 15 ft and h with 3 ft.
A = $\frac{1}{2}$ * 15 ft * 3 ft
= $\frac{45}{2}$ $ft^{2}$
Convert it into mixed fraction
22$\frac{1}{2}$ $ft^{2}$
The area of the triangle is $\frac{45}{2}$ $ft^{2}$ or 22$\frac{1}{2}$ $ft^{2}$