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This tool makes it easy to calculate sides, angles, height, perimeter and area of a trapezium.

A trapezium is a geometric shape that has four sides, two of which are parallel. An *isosceles trapezium* is a trapezium where the two non-parallel sides have the same length.

Calculations involving trapeziums can sometimes be done simpler by treating them as rectangles with two right-angled triangles on the sides. The area can be calculated by multiplying the mean of the two parallel sides by the height.

Area =

a + b

2

× h
2

Another word for trapezium, that is used mainly in the US and Canada, is *trapezoid*.