Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 55
inscribed in ase^^ment less than a semicircle, is an obtuseangle ; for it is measured by half of the arc ^BAC, greater than a semicircumference. Cor. 4. Tlie opposite angles A and C, ofan inscribed quadrilateral ABCD, are to-gether equal to two right angles : for the an-gle BAD is measured by half… … PROPOSITION XIX. THEOREM. 7V*e anrrle formed hy two chords^ which intersect each other y ismeasured by half the sum of the arcs included ietuven its sides. 50 GEOJMETRY. Let AB, CD, be two chords intersectingeach other at E : then will the angleAEC, or DEB, be measured by half ofAC + DB. Draw AF…
Trigonometry · Geometry
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