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Such a shape is impossible - in 2 dimensions. But a tetrahedron (4 sided polyhedron) can. To imagine one, look up at the corner of a room, where 2 walls meet the ceiling. There are 3 right angles there. Now measure out a distance from the corner along each edge and put a dot there, then just connect the dots, with the fourth dot being the corner, and you have a tetrahedron with 3 right angles.

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Q: What 4 sided figure has exactly 3 right angles?
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