An easy to use online calculator to solve trapezoid problems. The angles, the height h, the area and the diagonals of a trapezoid are calculated given its 4 sides. Formulas of angles, height and area have been found in Solve Trapezoid Given its Bases and Legs.

How to use the trapezoid calculator

Enter the 4 sides a, b, c and d of the trapezoid in the order as positive real numbers and press "calculate" with b being the short base and d being the long base (d > b). When the problem has a solution, the outputs are: the angles A, B, C and D, the height h, the area and the lengths of the diagonals AC and BD of the trapezoid.

NOTE: b must be smaller than d.