if the area of a circle is 256 what is the radius.
2007-01-17 00:23:20 · 6 answers · asked by j cool 1 in Science & Mathematics ➔ Mathematics
256=pi*r^2
r^2=256/pi
r=(896/11)^1/2
=9.0251
2007-01-17 00:27:28 · answer #1 · answered by Dupinder jeet kaur k 2 · 0⤊ 1⤋
The formula for the area of a circle is:
Pi times radius squared.
If Pi*Rsqurared = 256
then the radius is the square root of (256/Pi)
2007-01-17 08:29:15 · answer #2 · answered by Anonymous · 0⤊ 1⤋
Area = pi * r ^ 2 (or pi multiplied by the square of the radius)
256 = 3.14 * r ^ 2
256/3.14 = r ^ 2
81.5286624 = r ^ 2
--> get the square root of both sides of equation
r = 9.029322368
diameter = 2r
d = 18.05864474 or 18.06
2007-01-17 08:37:37 · answer #3 · answered by Hana 3 · 0⤊ 0⤋
The area of a circle is:
A = (pi) x radius^2
So, radius^2 = A/pi
radius = SQR (A/pi)
= SQR(256/pi)
radius = 9.03
2007-01-17 08:28:57 · answer #4 · answered by TimmyD 3 · 0⤊ 1⤋
Area of a circle formula
A =Ï r²
256 =3.141592654 = r²
256 / 3.141592654 = r²
â81.48733086 = r²
9.027033337 = r
The radius is 9.03 Rounded to two deimal places
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2007-01-17 09:21:27 · answer #5 · answered by SAMUEL D 7 · 1⤊ 0⤋
9.025217197
2007-01-17 08:29:58 · answer #6 · answered by Onikids 2 · 0⤊ 0⤋