T H E E L E M E N T S |
Book I Proposition 9 | |
Let some arbitrary point D have been taken on AB, and AE equal to AD have been taken from AC , [I.3] and let DE have been joined, and upon DE let the equilateral triangle DEF have been constructed, and let let AF have been joined. I say that the angle BAC has been bisected by the straight line AF. |
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