Mathematics, 05.02.2021 07:40, pr47723

A wooden frame has screws at A, B, C, and D so that the sides of it can be pressed to change the angles occurring at each vertex. ABCD and AB CD, even when the angles change. Why is the
frame always a parallelogram?

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A wooden frame has screws at A, B, C, and D so that the sides of it can be pressed to change the an...