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Diameter of the base of a cone is 10.5 cm and slant height is 10 cm. Find its curved surface area.

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Answer

Radius of base = Diameter of base2\dfrac{\text{Diameter of base}}{2}

= 10.52\dfrac{10.5}{2} = 5.25 cm.

Given, l = 10 cm.

Curved surface area of cone = πrl.

Putting values in above equation we get,

Curved surface area = 227×5.25×10\dfrac{22}{7} \times 5.25 \times 10

= 11557\dfrac{1155}{7} = 165 cm2.

Hence, the curved surface area of right circular cone = 165 cm2.

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