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 244
Fig. 334. … PROPOSITION XTII. S83, Theorem,—Symmetrical spherical triancjUs are equiva-lent. * To understand what is meant by the projection of these lines, conceive a hemisphereirith its base on the paper, and represented by the circle abc, and all the arcs raised up from thepaper as they would be on the…
Geometry · Trigonometry
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