Question 23

The curved surface area and the diameter of a right circular cylinder are $$660 cm^2$$ and 21 cm respectively. Find its height (in cm).

Solution

Let height of cylinder = $$h$$ cm and radius, $$r=\frac{21}{2}$$ cm

Curved surface area = $$2\pi r h=660$$

=> $$2\times\frac{22}{7}\times\frac{21}{2}\times h=660$$

=> $$22\times3\times h=660$$

=> $$h=\frac{660}{66}=10$$ cm

=> Ans - (B)

Share on Whatsapp Share on Whatsapp

Create a FREE account and get: