2007-03-01 02:20:01 · 5 answers · asked by wick4d_on4 1 in Science & Mathematics ➔ Mathematics
A = pi r^2
4/9 pi = pi * r^2
4/9 = r^2
r = 2/3
2007-03-01 02:22:46 · answer #1 · answered by Phred 3 · 0⤊ 0⤋
The area of a circle is pi*r^2. So, do this:
pi*r^2 = (4/9)(pi)
The "pi"s cancel, and we are left with:
r^2 = (4/9)
Taking the square root of both sides, we have
r = +/-(2/3)
Since lengths are positive, r = 2/3.
2007-03-01 02:24:11 · answer #2 · answered by starryeyedhaze 3 · 0⤊ 0⤋
Area is equal to (pi) times (radius squared) A=(pi)|*r^2
4/9 (pi)=(pi)r^2
4/9=r^2
r=sqrt(4/9)
r=2/3
2007-03-01 02:27:26 · answer #3 · answered by dentroll 3 · 0⤊ 0⤋
r^2 = A/pi = 4/9
|r| = 2/3
2007-03-01 02:24:03 · answer #4 · answered by SS4 7 · 0⤊ 0⤋
2/3
area = pi * r^2
thus, r is the squareroot of 4/9
= 2/3
2007-03-01 02:22:20 · answer #5 · answered by tonberry79 3 · 0⤊ 0⤋