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 74
at DCEis a right angle. ##24. Each of the angles of a polygon of n sides, whose angles are all equal, is equal to —I— right angles. n 62 EUCLIDS ELEMENTS. Proposition 33. Theorem. The straight lines which join the extremities of tivo equal andparallel straight lines towards the same parts are also… … Construction. Join BC. Proof. Because AB is parallel to CD, [Hypothesis. and BC meets them, the alternate angles ABC, BCD are equal. [I. 29.Then, in the triangles ABC, BCD, (AB = CD, [Hypothesis. and BC is common,and the angle ABC = the angle BCD ; [Pronecl. ,\ the triangles are equal in all…
Euclid's Elements · Geometry · Mathematics, Greek
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