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S		 Book I   Proposition 43
For, since ABCD is a parallelogram, and AC its diameter,
    the triangle ABC is equal to the triangle ACD. [I.34]

Again, since EH is a parallelogram, and AK is its diameter,
    the triangle AEK is equal to the triangle AHK.

For the same reason
    the triangle KGC is also equal to the triangle KFC.
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