T H E E L E M E N T S |
Book I Proposition 29 | |
The angle EGB was proved equal to the angle GHD. Let the angle BGH be added to each; therefore the angles EGB, BGH are equal to the angles BGH, GHD. [C.N.2] But the angles EGB, BGH are equal to two right angles; [I.13] therefore the angles BGH, GHD are also equal to two right angles. |
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