**Solids for which V = A_{b} × h**

This is a group of solids in which the volume is equal to the product of the area of the base and the altitude. Two types of solids belong to this group namely,

*prisms*and

*cylinders*.

**Prism and Cylinder**

A solid is said to be prismatic or cylindrical if every cutting plane parallel to base are the same in both shape and size. If the base is a closed polygon the solid is a prism, whereas, the solid is a cylinder if the base is a closed loop of a curve line. The name of the prism and cylinder is according to the shape of its base. A prism with a pentagon base is called a pentagonal prism and a cylinder of circular base is called circular cylinder. The volume of these two solids is given by the formula

where *V* = volume, *A _{b}* = area of the base, and

*h*= altitude.