# NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.2 – Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for CBSE/Class-9 : get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-9. Different Types of Shapes Also Its Volume and Total Surface …

Q-4 The diameter of a roller is and its length is . It takes complete revolutions to move once over to level a playground. Find the area of the playground in . Solution:

• The roller length is (h)
• Total no. of revolutions
• Distance covered by roller in one revolution
• Area of the playground
• ( complete revolutions to level a playground)

Q-5 A cylindrical pillar is in diameter and in height. Find the cost of painting the curved surface of the pillar at the rate of . Solution:

• The pillar height
• Painting rate
• Curved surface
• Total cost of painting
• (Painting rate )

Q-6 Curved surface area of a right circular cylinder is . If the radius of the base of the cylinder is , find its height. Solution:

• The radius of the base r and the height of the cylinder h.
• Area of a right circular cylinder is

Curved surface area

Q-7 The inner diameter of a circular well is . It is deep. Find

1. Its inner curved surface area,
2. The cost of plastering this curved surface at the rate of

Solution:

Circular well radius The well depth Plastering rate

• Curved surface
• Cost of plastering =

Q-8 In a hot water heating system, there is a cylindrical pipe of length and diameter . Find the total radiating surface in the system. Solution: