T H E E L E M E N T S |
Book I Proposition 28 | |
Again, since the angles BGH, GHD are equal to two right angles, and the angles AGH, BGH are also equal to two right angles, [I.13] the angles AGH, BGH are equal to the angles BGH, GHD. Let the angle BGH be subtracted from each; the remaining angle AGH is equal to the remaining angle GHD; and they are alternate; |
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