SOLUTION: Two cylinders of equal radii have heights in the ratio of 1:3. If the total surface area of the two cylinders is 770cm2 and the shorter cylinder is 7 cm high, find the common radii
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Question 1141329: Two cylinders of equal radii have heights in the ratio of 1:3. If the total surface area of the two cylinders is 770cm2 and the shorter cylinder is 7 cm high, find the common radii?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
small cylinder: radius r, height 7; total surface area
large cylinder: radius r, height 3*7=21, total surface area
The total surface area is 770:
With the "pi"s in that equation, the answer isn't going to be a "nice" number.... Use a calculator....
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