## Geometry: Common Core (15th Edition)

circumference is $15\pi\ m$ area is $56.25\pi\ m^2$
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 $A=\pi r^2=\pi(7.5^2)=56.25\pi$