**Area** refers to the amount of space within a 2D shape.

Surface area is the amount of space on the outside of a 3D object.

## Area of a RectangleEdit

## Area of a TrapeziumEdit

a and b are the lengths of the two parallel sides.

## Area of a CircleEdit

## Surface Area of a SphereEdit

## Surface Area of a ConeEdit

The curved surface area only is:

l is the distance from the outer edge of the circular base to the tip of the cone.

The whole surface area is: