Solve the problem.
-The area of a circle is found by the equationon A $$\mathrm { A } = \pi \mathrm { r } ^ { 2 }.$$ . If Ifthe area A of a certain circle is 49? square centimeters, find its radius r.
A) $$\mathrm { r } = 7 \sqrt { \pi } \mathrm { cm }$$
B) $$\mathrm { r } = \pm 7 \mathrm {~cm}$$
C) $$\mathrm { r } = 7 \pi \mathrm { cm }$$
D) $$\mathrm { r } = 7 \mathrm {~cm}$$

Question

Quizplus · Accepted Answer

Given the area $ A = 49\pi $ square centimeters and the formula for the area of a circle $ A = \pi r^2 $, we can solve for $ r $ by setting $ 49\pi = \pi r^2 $. Dividing both sides by $ \pi $ and taking the square root gives $ r = 7 $ cm.

Solve the Problem A=πr2.\mathrm { A } = \pi \mathrm { r } ^ { 2 }.A=πr2.

Solve the Problem $\mathrm { A } = \pi \mathrm { r } ^ { 2 }.$