Trapezoid is a quadrilateral which has at least one pair of parallel sides. It is called Trapezium in Britain and Trapezoid in North America. The trapezoid has 2 sides that are parallel lines.

Basic properties of Trapezoid:

• Every trapezoid has two bases
  
  
• Every trapezoid have two legs
  
  
• The height of the trapezoid is the perpendicular distance from one base to the other

Trapezium/Trapezoid Formula:

Area of Trapezium = ½×(a + b)×h

where
        a, b = sides, h = height

Perimeter of Trapezium = a + b + c + d

where
        a, b, c, d = sides