Quadrilateral, sides, diagonals, midpoints, squares
The figure shows a quadrilateral ABCD,
E and F midpoints of diagonals AC and BD respectively. If AB = a, BC =
b, CD = c, AD = d, AC = e, BD = f, and EF = m, prove that
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Median length, Apollonius' Theorem
Euclid's Elements Book II Proposition 13