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
SPHERICAL TRIGONOMETRY. 243 PROP. IX. • In a spherical triangle the greater angle is opposite to thegreater side ; and conversely. Let ABC be a spherical triangle, the greater angle A is opposedto the greater side BC. Let the angle BAD be made ^ eqrjal to the angle B^ and thenBD, DA will be equal,…
Euclid's Elements · Geometry · Trigonometry
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