Verified answer

The area of a circle is A = π x r x r where r = radious of the circle

So 9π = π x r x r

9 = r x r

r = 3

Circumference of a circle is C = π x D where D is Diameter of the circle

C = π x 2 x r

= π x 2 x 3 = 6π Answer

Not only you can't do the work, you didn't even ask it in the right category. This is GEOGRAPHY, not GEOMETRY. We're breeding second class citizens.