Question

The area of a circle with radius R is given by the formula A=πr².If a circle has area 225π square inches, what is the radius?

Answer 1

A = pie r^2
225 pie = pie r^2
(Pie and pie cancel each other out when divided leaving us with..)
225 = r^2
and take the square root
15 = r

Answer 2

\[πr^2 = π225r^2 ⇒ r^2 = 225\]

Then as KatrinaKaif says, take the square root of both sides, _et voilà_.

Answer 3

Course, I made a mistake above… Wish I could edit… but it should not say
\[\pi225r^2\] but rather \[\pi225\]

Answer 4

inother words the answer is 15sqrtpie

Answer 5

No, just 15, @outkast3r09. The question was what is the radius, not what is the square root of the area.