## Thinking Mathematically (6th Edition)

C = 25.1 cm, A = 50.3 $cm^{2}$
Given r = 4 cm The formula for circumference of a circle is: C = 2$\pi$r = 2$\pi$ x 4 = 8$\pi$ = 25.1 cm The formula for area of a circle is: A = $\pi$ $r^{2}$ =$\pi$ $4^{2}$ = 16$\pi$ $cm^{2}$ = 50.3 $cm^{2}$