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in Surface Areas And Volumes by (42.6k points)
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A joker’s cap is in the form of a right circular cone of base radius 7 cm and height 27 cm. Find the area of the sheet required to make 10 such caps.

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Radius of the cone, r = 7 cm 

Height of the cone, h = 27 cm 

Slant height of the cone (l)

∴ Total area of the sheet required for 10 caps 

= 10 x 22 √778

= 6136.383 cm2

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