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 244
hat is, to AD, BCwill be equal to BD andtherefore (5.) the angle D,or the angle A will be equalto theaugleBCD, that is, theinterior angle at the baseequal to the exterior andojJposite. 2. If AB, BC together be greater than a semicircle, that is greaterthan ABD, BC will be greater than BD; and… … 2Mi SPHERICAL TRIGONOMETRY. N(f^, since the angles BCD, BCA are equal to two right angle?, ifthe ati;j;le A be greater than BCD, A and ACB together will be great-er than two right angles. If A be equal to BCD, A and ACB toge-ther, will he equal to two right angles; and it A be less than BCD,A and…
Euclid's Elements · Geometry · Trigonometry
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