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Q.

A conical party cap has a slant height of 18 cm. The perimeter of the base of the cap is 44 cm. The cap is to be covered with glossy paper. What is the area of the glossy paper required to cover the cap?

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a

296 cm2

b

329 cm2

c

476 cm2

d

396 cm2

answer is C.

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Detailed Solution

It is given that, the perimeter of the base of the cap = 44 cm

Let the radius of the circular base of the cap be r.

2πr=44

2×227×r=44

r=44×72×22=7 cm

The area of the glossy paper required to cover the cap is equal to the curved surface area of the cap.

Slant height (l) of the cap = 18 cm

Thus, the curved surface area of cap = πrl = 227×7×18=396

Hence, the area of the glossy paper required to cover the cap is 396 cm2.

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