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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: $pi*r(l+r)$