Question

The radius of a semicircle is 3 centimeters. What is the semicircle's area?

Answer 1

Answer:

$A = \frac{9}{2} \pi\ cm^{2}$

Step-by-step explanation:

Area of a full circle is $r^{2} \pi$.

Area of a semicircle is exactly half of it: $\frac{1}{2} r^{2} \pi$.

$A = \frac{1}{2} 3^{2} \pi = \frac{9}{2} \pi = 14.137\ cm^{2}$