Trapezoid or trapezium, as it's known in the UK,  is a quadrilateral with two parallel sides, shown as the top and bottom in this diagram.  The height of a trapezoid (h) is the perpendicular distance between the two parallel sides.

A trapezoid volume is made of four trapezoids one the sides.

Trapezoid Calculators

• Area of a Trapezoid based on top, bottom and separation
• Area of a Trapezoid based on length of 4 sides
• Height of a Trapezoid
• Angles of a Trapezoid