|Book I Proposition 22|
For, since the point F is the center of the circle DKD,
FK is equal to FD.
But A is equal to FD;
therefore FK is equal to A.
Again, since the point G is the center of the circle HKH,
GK is equal to GH.
But C is equal to GH;
therefore GK is equal to C.
FG is also equal to B;
the three straingt lines KF, FG, GK are equal to the three straight lines A, B, C.
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