2007-01-27 10:09:23 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Well, the formula for area of a circle is:
A = pi*r^2, where A is the area and r is the radius.
Knowing that, we can plug in the area and solve for r.
A = pi*r^2
A/pi = r^2
sqrt( A/pi ) = r (r > 0, since this is a radius and negative #'s wouldn't make sense)
Voila! :)
2007-01-27 10:16:47 · answer #1 · answered by Lola 3 · 0⤊ 0⤋
A=pi*R^2
R=radius; A=area
Radius of a circle when we got the area:
Radious=+- square root(A/pi)
2007-01-27 10:24:15 · answer #2 · answered by Johnny 2 · 0⤊ 0⤋
A circle's area is given by the formula pi X radius X radius, or "pi-R-squared"
So if you know the area, you can just rearrange this formula:
2007-01-27 10:17:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Well Area, A=pi(r)squared. So you divide by pi and take the square root of what you have after that. for instance say the Are is equal to 4pi, which is roughly 12.56666. You then divide by pi giving you 4, then take the square root, giving you 2.
2007-01-27 10:17:37 · answer #4 · answered by Jeremy T 1 · 0⤊ 0⤋
Area = Pi x Radius^2
There fore,
Area/Pi = Radius^2
Therefore,
Square root of Area/Pi = Radius
2007-01-27 10:17:18 · answer #5 · answered by Mark Antony 3 · 0⤊ 0⤋
ex. area=1....
pir^2=1
r^2=1/pi
take squart root of 1/pi
answer = sqrt(pi)/pi
2007-01-27 10:16:45 · answer #6 · answered by Anonymous · 0⤊ 0⤋
A= pi*r^2 so r= sqrt( A/pi)
2007-01-27 10:15:48 · answer #7 · answered by santmann2002 7 · 0⤊ 0⤋