Asked by kelvin

if a cone is cut through the centre where it makes perpendicular to the vertex.what will be the surface area of the obtained half the cone
Answered by kelvin
please any concept or formula for the previous question,i stuck
Answered by Steve
The curved part (and maybe the base) is just half the surface area of the cone, for which I'm sure you have the formula.

The interior which is exposed is just a triangle. Its area is also easy to find.
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