How do you find the radius of a circle with the given area?
Like: A=28.96 and I have to use pi
Thanks in advance!
2007-01-04 08:55:11 · 6 answers · asked by Aanchi11 2 in Science & Mathematics ➔ Geography
A= (pi) * r^2
so ...
28.96 = pi * r^2
(28.96/pi) = r^2
sqrt (28.96/pi) = r
2007-01-04 08:59:41 · answer #1 · answered by arturo r 2 · 1⤊ 0⤋
pi*r^2= area of a circle
therefore if area is= 28.96 then
28.96= 3.142*r^2
28.96/3.142= r^2
9.217= r^2
square root 9.217 = r
r= 3.036
2007-01-05 08:00:26 · answer #2 · answered by fari 1 · 0⤊ 0⤋
The area of a circle is: A=pi*R^2.
R^2=A/pi
R=sqrt(A/pi)
R=sqrt(28.96/3.14)=3.036
2007-01-04 19:50:09 · answer #3 · answered by Anonymous · 0⤊ 0⤋
well, you can use the area formula for a circle in reverse:
we know that A=pi*r^2, so we can rewrite it
A/pi = r^2
r = sqrt(A/pi)
the square root of 28.96/pi is about 3
2007-01-04 16:58:45 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Pi r not square, they are round.
2007-01-05 14:33:42 · answer #5 · answered by DanG 2 · 1⤊ 0⤋
wow...
Nothing like redundancy in answers.
2007-01-05 03:01:38 · answer #6 · answered by Michael, Count de Berçon 2 · 1⤊ 0⤋