Question 122
The radius of base and curved surface area of a right cylinder is ‘r’ units and $$4\pi rh$$ square units respectively. The height of the cylinder is:
Solution
Let height of cylinder = $$H$$ units
Curved surface area of cylinder = $$2\pi rH$$
According to ques, => $$2\pi rH=4\pi rh$$
=> $$H=\frac{4}{2}h$$
=> $$H=2h$$ units
=> Ans - (A)
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