Curved surface area of a cylinder is 1980 cm2 and radius of its base is 15cm .find the height of the cylinder(π=22/7)
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9th std geometry
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Curved surface area of cylinder=2πrh
1980=2×22/7×15×h
1980×7=44×15×h
13860=660×h
13860/660=h
1386/66=h
126/6=h
21=h
h=21
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