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 25
he two EC, CF, each to each; but the baseDF is also equal to the base EF; therefore the angle DCF is equal(8. l.)totheangIeECF; and they are adjacent angles. But, when theadjacent angles which one straight line makes with another straightline are equal to one another, each of them is called a right… … OF GEOMETRY. BOOK I. •2d
Euclid's Elements · Geometry · Trigonometry
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