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 319
Hl (?), as at F. Now,every point in HF within the angle BAE has itssymmetrical in HF {^05\ Thus, by taking threepoints, not in a straight line, in the angle BAE, wecan show that their syrametricals are in the planeBAE, and also in AED. In like manner, allthe angles of ABCDE can be shown to be in…
Geometry · Trigonometry
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