A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 136
ygon. [The student shouldgo through the process.] Then revolve the tri-angle AOE upon AO as an axis till it falls in theplane of AOB; and as angle OAE = angle OAB,and AE =: AB, the triangles will coincide. Henceangle OEA, the half of angle E of the polygon. Fig. in.3. equals angle OBA the half of… … 116 ELEMENTAEY PLANE GEOMETRY. 263, ScH.—That the above style of argument fails in the case of a polygon ofan eveji number of sides, may be observed by attempt-ing to apply it. Thus, from Fig. 192, we would haveA = C, B = D, C = E, D =r F, E = A, and F = B.From these we have A = C =: E, and B = D =…
Geometry · Trigonometry
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