A Birthday cap is in the form of a right circular cone which has base of radius as 9 cm and height e...........

Quantitative Aptitude ( CCS) Mensuration 3D

A Birthday cap is in the form of a right circular cone which has base of radius as 9 cm and height equal to 12 cm. Find the approximate area of the sheet required to make 8 such caps.

304 cm²

3045 cm²

3000 cm²

2586 cm²

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Explanation:

r = 9, h = 12
So slant height, l = √(92+122) = 15 cm
So curved surface area of a cap = πrl = 22/7 * 9* 15 = 424 sq. cm
So curved surface area of 8 such cap = 424*8 =3392 sq. cm which is also equal to area of sheet
required to make 8 such caps

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