T H E E L E M E N T S |
Book III Proposition 17 | |
For let the center E of the circle be taken; [III.1] let AE be joined, and with center E and distance AE let the circle AFG be described; from D let DF be drawn at right angles to EA, and let EF, AB be joined; I say that AB has been drawn from the point A touching the circle BCD. |
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