With great difficulty because a cone is a 3D object and only 2D shapes have perimeters
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You don't. Perimeter is a concept associated with plane figures, not solid shapes.
The shape described cannot be a cone since a cone has a base at one end and a point - of zero length - at the other!
To find the perimeter you add and to find the area we multiply.
perimeter of what quadrant?
what is the perimeter of a pentegon?