Question

The area of a circle is 49π in². What is the circumference, in inches? Express your answer in terms of \piπ.

Answer 1

area of circle =  π r²

π r²= 49 π

r²= 49             r= √49                  r= 7

circumference of circle = 2 π r

                                       = 2×7 × π

                                       = 14 π