NCERT Solutions for Class 9 Maths Chapter 13
Important NCERT Questions
Surface Areas and Volumes
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 13.2
Page No:217
Questions No:9 Part-1
Find the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.
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Radius of cylindrical petrol storage tank r = 4.2/2 = 2.1 m and height h = 4.5 m.
Curved surface area of cylindrical petrol storage tank = 2πrh
= 2 × 22/7 × 2.1 × 4.5 = 2 × 22 × 0.3 × 4.5 = 59.4 m²
Hence, the curved surface area of cylindrical petrol storage tank is 59.4 m².