What is the height of a solid right circular cylinder whose radius is 3 cm and total surface area is 60 π cm2?
Answer & explanation
Correct answer: option 3
We know that,
Total surface area of cylinder = 2πr(r + h)
We have,
Radius of right circular cylinder = 3 cm.
Total surface area of cylinder = 60π cm².
Total surface area of cylinder =
2 π r (r + h) = 60π
= 2 π × 3(3 + h) = 60π
= (3 + h) = 10
= h = 7 cm