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Question

The lateral surface area of a right circular cone of height 28 cm and base radius 21 cm is:


A

2110 cm2

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B

2310 cm2

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C

1155 cm2

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D

1055 cm2

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Solution

The correct option is B

2310 cm2


Given, h = 28 cm; r = 21 cm

Therefore, slant height (l) = 282+212

= 35 cm

Lateral surface area = πrl

= 227 × 21 × 35

= 2310 cm2


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