Trapezoid Angle Calculator
MathCalculate the supplementary angle on the same leg of a trapezoid from one known angle.
Supplementary Angle
The angle on the same leg, supplementary to the known angle.
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Frequently Asked Questions
Why do the two angles on the same leg add up to 180 degrees?
Because the two bases of a trapezoid are parallel, each leg acts as a transversal line crossing them. The two angles on the same leg are co-interior angles, which always sum to 180 degrees for any pair of parallel lines.
Does this work for the angles on the other leg too?
Yes, the same supplementary relationship applies independently to each leg. The two angles on one leg sum to 180, and the two angles on the other leg also sum to 180, though the actual angle values can differ between the two legs unless the trapezoid is isosceles.
What is true for all four angles together?
All four interior angles of any trapezoid, like any simple quadrilateral, always sum to 360 degrees total.
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