Volume

To find the area of a square:

lenght x width

To find the area of a rectangle:

length x width 

To find the are of a parralleogram:

base x height

To find the area of a trapezium:

1/2 (a+b) x height

To find the area of a right angled triangle:

1/2 x base x height

To find the area of a circle:

3.14 x radius x radius

To find the circumference of a circle:

3.14 x diameter