T H E E L E M E N T S |
Book IV Proposition 4 | |
Therefore the three straight lines DE, DF, DG are equal to one another; therefore the circle described with center D and distance one of the straight lines DE, DF, DG will pass also through the remaining points, and will touch the straight lines AB, BC, CA, because the angles at the points E, F, G are right. |
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