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:

See also[edit | edit source]

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