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 43
42 ELEMENTS … but the triangle ABC is the half of the parallelogram E3C A, becausethe diameter AB bisects (34. 1.) it; and the triangle DBC is the halfof the parallelogram DBCF, because the diameter DC bisects it; andthe halves of equal things are equal. (7. Ax.); therefore the triangleABC is equal to the…
Euclid's Elements · Geometry · Trigonometry
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