How do you find the circumference of a circle if the area is 49?

Answer 1

You need just a smidgen of algebra.

The area of any circle is (pi) x (radius)2 .

For this circle, you know that (pi) x (radius)2 = 49.

You can massgae this around to find the radius, and then

the circumference is just (2 pi) x (radius).

If you need it all in one step, then Circumference= 2 x sqrt(pi x Area) ,

but the other way is easier for me, because I don't have to memorize

another formula. I find deriving easier than memorizing..