Question

Which of the following is the height of the cylinder whose radius is 7 CM and curved surface area is 660cm²? (Use π =
$\frac{22}{7}$
​

Answer 1

Answer:

Let height =h

Total surface area=2πr(r+h)

r=7cm

⇒968=2×

7

22

×7(7+h)

⇒

44

968

=7+h

⇒h+7=22

⇒h=22−7

=15cm.