Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 79
le BOC, inscribedm a segment less than a semicircle, isan obtuse angle ; for it is measured by half the arc BA C,greater than a semicuxumference. Cor. -1. The opposite angles A andC, of an inscribed quadrilateral ABCD,ire together equal to two right angles :for, the angle BAB is measured byhalf the…
Geometry · Trigonometry
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