Q. 8

# The external surface area of a hollow cylinder is 540 πsq.cm. Its internal diameter is 16 cm and height is 15 cm. Find the total surface area.

Given : External surface area of hollow cylinder = CSAext = 540 cm2

Internal diameter = d = 16 cm

Height of the hollow cylinder = h = 15 cm

To find : Total surface area = TSA of hollow cylinder = ?

Formula : r = CSA of cylinder = 2 rh

Solution : Internal radius of cylinder = r = = = 8 cm

Internal surface area of hollow cylinder = CSAint = 2πrh

= 2π × 8 × 15

= 16π × 15 = 240π cm2

TSA of hollow cylinder = CSAext + CSAint = 540 + 240 = 780 cm2

The total surface area of the hollow cylinder is 780 cm2.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses 