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 285
and DEF are also every way equal. Q. E. D. 2S4i NOTES. By help of the same postulate, the 5th may also be rery easilydemonstrated. Let ABC be an isosceles triangle, in which AB, AC are the equalsides; the angles ABC, ACB opposite to these sides are also equal. Draw the straight line EF equal to BC,…
Euclid's Elements · Geometry · Trigonometry
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