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

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175 cm

2

185 cm

2

165 cm

2

195 cm

2

answer is A.

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Detailed Solution

Given, diameter of the base of a cone is 10.5 cm.
So, radius,

r = d 2

r = 10.5 2

⇒

5.25 cm
The curved surface area of the cone is,
CSA

= π × r × l

CSA = 227 × 5.25 × 10

CSA

= 165

2

Hence, the curved surface area of the cone is 165 cm

2

.
Therefore, the correct option is 1.

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