The radius and height of a cone are in the ratio 3:4 the area of the base is 154cm².find the area of the curved surface
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Area of the base=πr²=154 cm²
Therefore radius is √154/π cm=7 cm
The height of the cone is 7×4/3=9.3 cm
Area of the curved surface=πrl
where l=√(9.3)²+7²=11.6 cm
π×7×11.6=255.9~256 cm²
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