Thinking Mathematically (6th Edition)

C = 12$\pi$ $\approx$37.7 yd A = 36$\pi$ $yd^{2}$ $\approx$ 113.1 $yd^{2}$
Given d = 12 yd Formula for circumference of a circle: C = $\pi$d = $\pi$ x 12 = 12$\pi$ = 37.7 yd Formula for Area of a circle: A = $\pi$ $r^{2}$ =$\pi$ $6^{2}$ = 36$\pi$ $yd^{2}$ =113.1 $yd^{2}$