2007-02-22 07:34:00 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Area formula for a circle
A = π r²
you have to know the area square inches, feet, yards etc.
A = π r²
A / π = r²
√A /π = √r²
once you square root and you know the radius
Example
let
314.1592654 = area
π = 3.141592654
r² = radius
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A = π r²
√314.1592654 / 3.141592654 = √r²
√100 = √ r²
10 = r
The radius is 10
Insert the radius in the circumference formula
C = 2 π r
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2007-02-22 08:14:21 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
divide the area by pi and then take the sqrt
2007-02-22 15:36:52 · answer #2 · answered by creepy_mitch 2 · 0⤊ 0⤋
area=pi*RADIUS^2
solve for radius..
radius = (area/pi)^(1/2)
or radius = sqrt(area/pi)
2007-02-22 15:38:02 · answer #3 · answered by Sum Girl 4 · 0⤊ 0⤋
A=pi r^2
r= â(A/pi)
2007-02-22 15:37:55 · answer #4 · answered by gumtrees 3 · 0⤊ 0⤋