T H E E L E M E N T S |
Book III Proposition 26 | |
And, since
the angle at A is equal to the angle at D, the segment BAC is similar to the segment EDF; [III.Def.11] and they are upon equal straight lines. But similar segments of circles on equal straight lines are equal to one another [III.24] therefore the segment BAC is equal to EDF. |
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