The diameter of a cone is 14 cm and its slant height is 9 cm .Then the area of its curved surface is
138 cm2
198 cm2
195 cm2
148 cm2
A
198 cm2
B
195 cm2
C
148 cm2
D
138 cm2
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Solution
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We know that the area s of the curved surface of a right circular cone of radius r and slant height I is given by S=πrl Here r=142cm=7cmandl=9cm ∴S=227×7×9cm2=198cm2
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