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Books Books 61 - 61 of 61 on In any triangle, the sum of the three angles is equal to two right angles, or 180..  
" In any triangle, the sum of the three angles is equal to two right angles, or 180. "
Introduction and books 1,2 - Page 218
by Euclid, Sir Thomas Little Heath, Johan Ludvig Heiberg - 1908
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The American Mathematical Monthly: Devoted to the Interests ..., Volumes 11-12

Benjamin Franklin Finkel - Mathematics - 1904
...which concludes, "Hence spherical trigonometry is not dependent upon whether in a rectilinear triangle the sum of the three angles is equal to two right angles or not." Just so concludes Chapter XI of his New Elements: "Therefore the equations for spherical triangles...
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