2007-12-09 18:28:25 · 6 answers · asked by glamour girl 1 in Science & Mathematics ➔ Mathematics
A = π r ²
r ² = A / π = 100 / π
r = 5.64 in.
2007-12-09 20:07:09 · answer #1 · answered by Como 7 · 2⤊ 0⤋
Well we know the formula for finding the area of a circle with the radius, so we rearrange the equation solving for r, then we plug in the value for the radius we know.
A = pi*r^2
sqrt(A/pi) = r
sqrt(100/pi) = r
r = 5.641895835 inches
2007-12-10 02:33:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
area = pi r^2
100 = (3.14)r^2
divide both sides by 3.14
31.85 = r^2
take the sqrt of both sides
sqrt(31.85) = sqrt(r^2)
5.64 = r
So 5.64 is the radius of the circle
2007-12-10 02:34:48 · answer #3 · answered by Jamanski 3 · 0⤊ 0⤋
PI r² = area
2007-12-10 02:32:25 · answer #4 · answered by Quality Post 2 · 0⤊ 0⤋
Area = piXr^2
sqrt(A/pi) = r
sqrt(100/pi) = r
r = 5.641895835 inches
cheers!!!!!!!!!!!
2007-12-10 03:02:11 · answer #5 · answered by Anonymous · 0⤊ 0⤋
area=pir^2=100
r=sqrt100/pi=10/sqrtpi=5.64inch
2007-12-10 02:31:49 · answer #6 · answered by someone else 7 · 0⤊ 0⤋