Cylinder


Instructions: In "spin" mode it freely spins and will respond to your mouse. In "drag" mode it stops spinning and you can use your mouse to move it.

Volume of a Cylinder
Just multiply the area of the circle by the height of the cylinder:
 Area of the circle: π × r^{2}
 Height: h
 Volume = Area × Height = π × r^{2 }× h
How to remember: Volume = pizza
Imagine you just cooked a pizza.
The radius is "z", and the thickness "a" is the same everywhere ... what is the volume?
Answer: pi × z × z × a
(we would normally write "pi" as π, and z × z as z^{2}, but you get the idea!)
It Doesn't Have to Be Circular
Usually when we say Cylinder we mean a Circular Cylinder, but you can also have Elliptical Cylinders, like this one:
You can even have stranger cylinders: if the crosssection is curved and is the same from one end to the other, then it will still be a cylinder.
More Cylinders