## College Algebra (10th Edition)

Area = $9\pi \approx 28.27433$ square feet Circumference = $9\pi \approx 28.27433$ feet
RECALL: (1) The area $A$ of a circle is given by the formula $A=\pi{(\frac{d}{2})^2}$ where $d$ = diameter (2) The circumference $C$ of a circle is given by the formula $C=\pi{d}$ where $d$ = diameter. Use the formula in (1) above to obtain the area of the circle: $A=\pi(\frac{6}{2})^2 \\A=\pi(3^2) \\A=\pi(9) \\A=9\pi \approx 28.27433$ Thus, the area of the circle is $9\pi$ or approximately $28.27433$ square feet, Use the formula in (2) above to obtain the circumference of the circle: $C=\pi{d} \\C=\pi(9) \\C=9\pi$ Thus, the circumference of the circle is $9\pi$ or approximately $28.27433$ feet.