Trapezoid

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A trapezoid is a four-sided polygon with two parallel sides.

Trapezoid.gif

The following properties arise from the definition:

  • Two of the pairs of adjacent angles sum to 180o
  • The area is the mean of the parallel sides multiplied by the distance between them.
  • The perimeter is equal to the sum of the oblique sides plus the sum of the tangent sides.
  • The sum of the oblique angles will be equal to the sum of the tangent angles.
In England, such a shape is called a trapezium.[1]
  1. "Trapezium". Britannica Online Dictionary.