Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 447
953. Def. A spherical triangle having all of its angles rightangles is called a trirectangular spherical triangle. Thus two meridians, as JV^ and NB, making at the north polean acute or an obtuse Z, form with the equator a birectangularspherical A. If the Z. between NA and NB is made a rt. Z,A ANB…
Geometry, Plane · Geometry, Solid
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