|Book IV Proposition 7|
Therefore GK, GC, AK, FB, BK are parallelograms;|
GF is equal to HK, and GH to FK. [I.34]
AC is equal to BD,
AC is also equal to each of the straight lines GH, FK,
BD is equal to each of the straight lines GF, HK, [I.34]
the quadrilateral FGHK ie equilateral.
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