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Showing content from http://www.mathsisfun.com/geometry/pyramid-vs-cone.html below:

Why is a Pyramid like a Cone?

Try increasing the number of sides:

images/geom-oblique-3d.js?mode=pyrn

Yes! The pyramid starts to look like a cone!

Also try moving points A and B.

The volume formulas are the same:

V = 13 × (Base Area) × Height

For a circular cone the base area is πr² (where r is radius) so we get:

Volume of Circular Cone = 13 × (πr²) × Height

For a square pyramid the base area is s² (where s is side length) so we get:

Volume of Square Pyramid = 13 × (s²) × Height

For other pyramids we just have to work out the base area.

And it doesn't matter if it is right (top directly above base) or oblique (slanted), the volume formula still works, but remember:

The height is at right angles to the base!

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