Some simple revision:

The Diameter of a circle is a straight line running through the centre and whose end points are on the circular boundary.

Thde radius is half the diameter.

Pi =~ 3.14159



Formulae:

Volume of a square: (where S = the length of a side) S³
Volume of a rectangular prism: L*W*H (Length*Width*Height)
Volume of a cylinder: πr²*h [(pi*radius*2)*distance between the faces.]
Volume of any cylinder that has a constant cross section along the height: A*h
Volume of a Sphere: 4/3πr³ (4/3 π * radius squared)
Volume of an ellipsoid: 4/3πabc (a b c = semi-axes of the ellipsoid)
Volume of a Pyramid: 1/3Ah (1/3 the area * the height)
Volume of a cone: