# Why is a Prism like a Cylinder?

Try increasing the number of sides:

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

Yes! The prism starts to look like a cylinder!

Also try moving points A and B.

## Volume

The volume formulas are the same:

V = (Base Area) × Height

For a circular cylinder the base area is πr^{2} (where r is radius) so we get:

Volume of Circular Cylinder = (πr^{2}) × Height

For a square prism the base area is s^{2} (where s is side length) so we get:

Volume of Square Prism = (s^{2}) × Height

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

## Right vs Oblique

And it doesn't matter if it is **right** (ends perfectly aligned) or **oblique** (slanted), the volume formula still works, but remember:

The height is at right angles to the base!