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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)

See alsoEdit

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