Why does line AE cut off from AB equal line CD?
AL is a line constructed equal to CD by Proposition II.
![](p3a.gif)
A is the center of circle F
![](p3b.gif)
Since A is the center of circle F, AE, which is cut off from AB, is equal to AL, and by axiom 1 is equal to CD.
![](p3c.gif)
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