The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 63
. 15. .-. the angle AGH = the angle GHD, [Axiom \. and they are alternate;.-. AB is parallel to CD. [I. 27. (2) Again, because the angles BGH, GHD are together equal to two right angles, [Hypothesis, and the angles AGH, BGH together = two right angles, [1.13. •. the angles AGH, BGH = the angles… … 52 EUCLIDS ELEMENTS. Proposition 29. Theorem. If a straight line meet two parallel straight lines, it makes (1) the alternate angles equal to one another ; (2) the exterior angle equal to the interior and opposite angle on thesame side; and also (3) the two interior angles on the same side together…
Euclid's Elements · Geometry · Mathematics, Greek
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