DK-GEORGMOHR 2016 Problem 3

Prove that all quadrilaterals $ABCD$ where $\angle B = \angle D = 90^o$ , $|AB| = |BC|$ and $|AD| + |DC| = 1$ , have the same area.

Dataset text AI-MO AoPS. Quoted with source.

Solutions

No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.