Mathematics

Mathematics, 24.11.2021 09:40, afitzgerald

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. AB CD and AB CD, even when the angles change. Why is the
frame always a parallelogram?

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

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