Question

If the area
of a circle is 9πr2
then its
its
circumferience is​

Answer 1

Answer:

Using “r” as something other than radius could cause some confusion.

If the radius of a circle is R than its area is pi R^2. If this is 9pirxr then 9 r^2 = R^2 and R = 3r.

The circumference of the circle is 2 pi R which is 6 pi r.

Answer 2

Answer:

6 pi r is the circumference of the circle whose area is 9 pi r 2