Work out trapezium area instantly with clear inputs, formula shown and shareable results.
A trapezium's area is the average of the two parallel sides times the distance between them. That average is also the length of the median joining the midpoints of the legs.
Area
A = ½(a + b) × h
Median
m = (a + b) / 2
The area and median do not require it, but the reported perimeter and base angle assume the two non-parallel sides are equal.
Then it is a parallelogram, and the formula reduces to A = a × h.