T H E E L E M E N T S |
Book III Proposition 37 | |
But the angle DEF is right; therefore the angle DEF is also right. And FB produced is a diameter; and the straight line drawn at right angles to the diameter of a circle, form its extremity, touches the circle; [III.16, Por.] therefore DB touches the circle. Similarly this can be proved to be the case even if the center be on AC. Being what it was required to prove. |
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