I want to know the best answer of the question from Surface areas and Volumes chapter of class 9th ncert math. The question from exercise 13.2 of math. Give me the easy way for solving this question of 2 It is required to make a closed cylindrical tank of height 1m and base diameter 140cm from a metal sheet. How many square meters of the sheet are required for the same? Assume π = 22/7
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It is required to make a closed cylindrical tank of height 1m and base diameter 140cm from a metal sheet. How many square meters of the sheet are required for the same? Assume π = 22/7 Q.2
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Let h be the height and r be the radius of a cylindrical tank.
Height of cylindrical tank, h = 1m
Radius = half of diameter = (140/2) cm = 70cm = 0.7m
Area of sheet required = Total surface are of tank = 2πr(r+h) unit square
= [2×(22/7)×0.7(0.7+1)]
= 7.48
Therefore, 7.48 square meters of the sheet are required.