#### Explanation:

First, we must find the area. The formula for the area of a circle is $A = \pi {r}^{2}$, and we know from the question that $r = 4$.

Therefore, $A = \pi \left({4}^{2}\right) = \textcolor{b l u e}{16 \pi}$ square feet.

Since the painter charges $1.50 per square foot, he would charge a total of 16pi*1.50=color(red)($75.40).

Nov 14, 2015

$75.39 #### Explanation: The area of a circle is given by the formula $\pi {r}^{2}$. Plugging the radius into the equation, we get: $\pi \times {4}^{2} = 16 \pi , \mathmr{and} 50.26 f {t}^{2}$If the sign costs$1.50 per square foot, then the cost for the sign is:
50.26 times $1.50 =$75.39