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Question

The total area of sheet required to make an open cone of height 24cm and radius 7cm is:

A
470 cm2
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B
450 cm2
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C
425 cm2
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D
550 cm2
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Solution

The correct option is D 550 cm2
Given, height of cone is h=24cm and radius is r=7cm.
Then, area of sheet required = surface area of cone
=πrl=πr(r2+h2)=2×227×7((24)2+(7)2)=2×22×25=550cm2.
Hence, option D is correct.

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