Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 191
and AE are both quadrants,the lines 01), OE, w-ill be f)erpen(licular to OA, and the angleDOE will still be equal to the angle of the planes AOD, AGE :hence the arc DE is tl>c measure of the angle containod bythese planes, or of the angle CAB. Cor. The angles of spherical triangles may !)e… … 192 GEOMETRY Sciiolium. Vertical angles, suchas ACO and BCN are equal ; foreither of them is still the angleformed by the two planes ACB,OCN. It is farther evident, that, in theintersection of two arcs ACB, OCN,the two adjacent angles ACO, OCB,taken together, are equal to tworight angles.
Trigonometry · Geometry
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