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Step-by-step explanation:
Diameter = 1.8 m
r = d/2
r = 1.8/2
r = 0.9m
curved surface area of cyclinder = 2 * 22/7 * r^2 = 2 * 22/7 * 0.9 * 0.9 = 5.08 m^2
No of revolution = 25
Therefore = 5.08×25 = 127 m2
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