Take any quadrilateral such as ABCD above. Construct the midpoints of each side and join them to form another quadrilateral EFGH. Varignon's Theorem asserts that the ...
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Ptolemy’s Theorem and the Almagest: we just found the best visual proof in 2000 years
And, so, the sum of opposite angles is half the sum of all the angles in the quadrilateral. But then, just like in a rectangle, the sum of all the angles in a quadrilateral is 360 degrees. and half ...
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