Question 58

Curved surface area of a cylinder is 110 $$cm^2$$. If the height of cylinder is 5 cm, then what will be the diameter of its base?

Solution

Let radius of cylinder = $$r$$ cm and height = $$h=5$$ cm

Curved surface area of cylinder = $$2\pi rh =110$$

=> $$2\times\frac{22}{7}\times r\times5=110$$

=> $$r=\frac{110}{110}\times\frac{7}{2}=3.5$$ cm

$$\therefore$$ Diameter = $$2\times3.5=7$$ cm

=> Ans - (B)

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