I can prove it's not a rectangle by drawing some lines, but is there a name for this kind of figure? Thanks.
2026-05-05 10:02:40.1777975360
A quadrilateral with one pair of opposite right angles. Is this a rectangle?
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It's only a rectangle if the other opposite pairs of angles are also right angles. However it is a cyclic quadrilateral since opposite pairs of angles add to 180 degrees.