Q1 of 22 Page 258

The ratio between curved surface area and total surface area of a right circular cylinder is 2 : 3. Find ratio between height and radius of the cylinder.

Let the height & radius of the right circular cylinder be h & r respectively.

Curved surface area of right cicular cylinder = 2πrh


Total surface area of right circular cylinder = 2πrh + 2πr2 = 2πr(h + r)


So, ratio of curved surface area to total surface area






So, ratio of height to radius is 2:1.


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