Question

What is the surface area of a cone when the slant height is 6 mm and the diameter is 4 mm?

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Answer 1

Diameter of cone = d = 4mm
So,
Radius of cone = r = 2mm
Slant Height = l = 6mm
Surface Area = A = ?

The formula for the surface area of cone is:


`A= \pi r(r+l)`

Using the values, we get:


`A= \pi (2)(2+6)=16 \pi` mm²

Therefore, the surface area of the cone with diameter 4mm and slant height of 6mm will be 16π mm²