How i find the best tricky way for solving the question of class 9th of Surface areas and Volumes chapter of class 9th give me the best and easy method for this question no.9 (1) of exercise 13.2 Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5m high.
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Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5m high. Q.9(1)
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Height of cylindrical tank, h = 4.5m
Radius of the circular end , r = (4.2/2)m = 2.1m
(i) the lateral or curved surface area of cylindrical tank is 2πrh
= 2×(22/7)×2.1×4.5 m2
= (44×0.3×4.5) m2
= 59.4 m2
Therefore, CSA of tank is 59.4 m2.