T H E E L E M E N T S	Book I   Proposition 44
	Then HLKF is a parallelogram, HK is its diameter, and AG, ME are parallelograms, and LB, BF the so-called complements, about HK; therefore     LB is equal to BF. [I.43] But, also,     the triangle C is equal to BF; therefore     LB is also equal to C. [C.N.1] And, since     the angle ABM is equal to the angle GBE, [I.15] while     the angle D to the angle GEB,     the angle ABM is also equal to the angle D.
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