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Find the height of a cylinder whose radius is 7 cm and the total surface area is 986 cm²?
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Step-by-step explanation:
Total surface area = 2(pi)r(r + h)
=> 986 cm^2 = 2 × 22/7 × 7 × (7 + h)
=> 493/22 cm^2 = 7 + h
=> 493/22 - 154/22 = h
=> h = 339/22
Therefore answer is 339/22
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