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 Rectangle[edit | edit source]
Area of a Trapezium[edit | edit source]
a and b are the lengths of the two parallel sides.
Area of a Circle[edit | edit source]
Surface Area of a Sphere[edit | edit source]
Surface Area of a Cone[edit | edit source]
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: