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

$ width*length $

Area of a TrapeziumEdit

$ (height*(a+b))/2 $

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

Area of a CircleEdit

$ pi*r^2 $

Surface Area of a SphereEdit

$ 4*pi*r^2 $

Surface Area of a ConeEdit

The curved surface area only is: $ pi*r*l $

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

The whole surface area is: $ pi*r(l+r) $

See alsoEdit