Find the total surface area of a cone whose radius is r/2 and slant height is 2l

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asked Mar 6, 2017 8.4k views

2 Answers

Freddy Benson · Answer 1 · 2017-03-13T06:27:56+0000

Total surface area of cone: πrl + πr²

Assuming the bottom of the cone is closed.

r = r/2, l = 2l

Total surface Area = π*(r/2)*2l + π(r/2)² = πrl + πr²/4

Total Surface Area = πrl + πr²/4

Find the total surface area of a cone whose radius is r/2 and slant height is 2l

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