SOLUTION: I have paint that equals 20 sq feet of coverage. I want to paint a circle. what is the circumference of a circle for 20 sq ft? I figure i will put a thumb tack in the middle of

Question 536469: I have paint that equals 20 sq feet of coverage. I want to paint a circle. what is the circumference of a circle for 20 sq ft? I figure i will put a thumb tack in the middle of the circle with a string that is half the total circle circumference. So how long do i make the string?
Thanks,
Melissa
reneefreedom@yahoo.com
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Area = 20 sq.ft
Area of circle = pi*r^2
20 = pi* r^2
20/pi = r^2
6.366 =r^2
r= sqrt(6.366)
r=2.52
Circumference = 2*pi*r
Circumference = 2*3.14 * 2.52
Circumference= 15.82 ft
m.ananth@hotmail.ca
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