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" A. (7.) A spherical triangle is made only by those circles which pass through the centre of the sphere, or by great circles. All triangles made by other circles are not considered. (8.) When we talk of the side of a spherical triangle, we mean, therefore,... "
Elements of Spherical Trigonometry - Page 4
by Augustus De Morgan - 1833 - 32 pages
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Library of Useful Knowledge: Geometry plane, solid, and spherical [by Pierce ...

Mathematics - 1835 - 684 pages
...А О В. But it would do equally well to draw the perpendiculars from any other point P in О А. (7.) A spherical triangle is made only by those circles...the apparent confusion of calling a line an angle. Thus, we may say that the side of a spherical triangle is a right angle ; meaning thereby that it is...
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Arithmetic, algebra, differential and integral calculus, by W. Rutherford ...

Royal Military Academy, Woolwich - Mathematics - 1853 - 474 pages
...В, В О С, А О С, at the centre, and hence when the side of a spherical triangle is spoken of, the angle which that side subtends at the centre of the sphere is meant. 4. The sides of a spherical triangle are usually denoted by the letters a, b, c, and the....
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