curved surface area of cylinder is 1980 cm² and radius of its base is 15 cm find the height of the cylinnder
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radius = 15 cm
height = ?
curved surface area = 1980
2 pi rh = 1980
2 × 22/7 ×15 × h= 1980
h = 1980×7÷22×15
h = 42 cm
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