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 421
hen is NO the projection of thearc which measmes B, and the projection ofa lies in tlie arc passing through BOB.* Havingthe angle B projected, if the hypotenuse a is theother given part, find the projection of C bytaking Be = Be = a, and drawing ee. Com-plete the projection by drawing AC through… … * A? has been remarked, this arc is really a semi-ellipse. This fact, together with themethod of constructing the semi-ellipse, and thus getting the correct projection of the hypot PROJECTION OF EIGHT ANGLED SPHERICAL TRIANGLES. 69 from P (towards N if B < 90% and towards N if B > 90°) a…
Geometry · Trigonometry
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