Quadrilaterals which you can experience through your fingers. The Quadrilaterals have 4 points with 3 non-colinear points and the sides only joining at the edges. The sum of all internal angles is 360 degrees and sum of all external angles is 360 degrees.
Quadrilateral ABCD Simulator
Vertex A is fixed at (250, 250). Drag B, C, D.
All sides stay between 5 and 10 units. The displayed angle is always the smaller one (≤180°).
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