Cylinder

cylinder

                                                

A cylinder is actually  two circles (one on the top and one on the bottom) and a rectangle in the middle.  The base is the same as the top and also between. It has one curved side. If we cut the middle  and lay it flat, it would  form a rectangle. The circumference  of the circle actually  forms the base of  the rectangle. Because it has a curved surface, it is not a polyhedron.

To calculate the VOLUME  of a CYLINDER, use this formula: V = πr2h

Just multiply the area of the circle by the height of the cylinder:

• Area of the circle: π × r²
• Height: h
• Volume = Area × Height = π × r² × h

Volume of a Cone vs Cylinder

The volume formulas for cones and cylinders are very similar:

The volume of a cylinder is:	π × r2 × h
The volume of a cone is:	π × r2 × (h/3)

So, the only difference is that a cone's volume is one third (¹/₃) of a cylinder's.

So, in future, order your ice creams in cylinders, not cones, you get 3 times more!