What is the total surface of a cone of radius 2r and siant height l/2 – InterviewSolution

1.

What is the total surface of a cone of radius 2r and siant height l/2

Answer»

Given, radius of the cone, R = 2r

Slant height of cone, L =l/2

Total surface area of cone =πR (L + R)

=π ×2r [ (l/ 2) + 2r ]

=π ×2r [ (l+ 4r) / 2 ]

=πr [l+ 4r ]

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