Answer
circumference is $15\pi\ m$
area is $56.25\pi\ m^2$
Work Step by Step
use the formula for cirumference
$C=\pi d=\pi(15)=15\pi$
radius is half of diameter
$r=\frac{1}{2}d=\frac{1}{2}(15)=7.5$
use the formula for area
$A=\pi r^2=\pi(7.5^2)=56.25\pi$
