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Practice mode Volume and Surface Area

A right circular cone has a base radius of 21 cm and a vertical height of 20 cm. Taking π = 22/7, what is its curved surface area?

Correct answer B. 1,914 sq cm

Explanation

Slant height l = square root of (21² + 20²) = 29 cm. CSA = πrl = 22/7 x 21 x 29 = 1914 sq cm.

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