If the radii of two cylinders are in the ratio 3 : 4 and their heights are in the ratio 2 : 9, find the ratio of their curved surface areas. height in the ratio is 2:9 so solve according to that ...
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let the height be 2h and 9h.
Therefore , required ratio
= ( 2pi × 3r × 2h ) / ( 2pi × 4r × 9h )
= 1 : 6
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