T H E E L E M E N T S |
Book I Proposition 29 | |
For, if the angle AGH is unequal to the angle GHD, one of them is greater. Let the angle AGH be greater [than the angle GHD]. Let the angle BGH be added to each; therefore the angles AGH, BGH are greater than the angles BGH, GHD. But the angles AGH, BGH are equal to two right angles; [I.13] therefore the angles BGH, GHD are less than two right angles. |
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