Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 147
146 ELEMENTS Because AB is parallel to DC, and the straight line AC meets them^the allcrnate angles BAC, ACD are equal (29. 1.); for the samereason, the angle CDE is equal to the angle ACD; wherefore alsoBAC is equal to CDE: And because the triangles ABC, DCE haveone angle at A equal to one at D,…
Euclid's Elements · Geometry · Trigonometry
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