the formula for the surface area of a cylinder is: A=2πrh+2πr^2 If the height of the cylinder is 10 inches, and the surface area is 200 sq. inches, determine the length of the radius
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200 = 20πr+2πr^2
πr^2+10πr = 100
r^2+10r = 100/π
(r+5)^2=[100/π+25]
r = -5 + sqrt[100/π+25]
r = 2.539 inches
πr^2+10πr = 100
r^2+10r = 100/π
(r+5)^2=[100/π+25]
r = -5 + sqrt[100/π+25]
r = 2.539 inches