## A Treatise on Trigonometry |

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7r-measure abscissa adjacent angles angle or arc circumscribed circle computation cos(s cos0 cosb cosc cose cosecant cosine cosQ cosr cot0 cotangent cotp cotQ csc0 determined without ambiguity different species differs from 90 distance divide equations formulae of Thm fourth quadrant geom Given two sides greater than 90 half the perimeter hypothenuse included angle less than 90 let xop logarithmic sines Napier-s rules nearer 90 nearer to 90 negative angle negative with reference Note oblique angle oblique triangle opposite angle ordinate perpendicular plane triangle abc positive or negative possible errors Prob radius ratios reader may prove revolution right angle right spherical triangle right triangles sec0 secant sin(s sin0 sinb sine sine and cosine sinp sinQ spherical triangle abc spherical trigonometry supplement tan0 tang tangent tanp terminal line theorem trigonometric functions values whence wherein