Books Books In any right lined triangle, having two unequal sides ; as the less of those sides is to the greater, so is radius to the tangent of an angle ; and as radius is to the tangent of the excess of... Trigonometry, Plane and Spherical: With the Construction and Application of ... - Page 68
by Thomas Simpson - 1748 - 77 pages ## Nine Geometricall Exercises: For Young Sea-men, and Others that are Studious ...

William Leybourn - Geometry - 1704 - 432 pages
...the Co-fine of half the Sum of the Sides, Is to the Co fine of half the Difference of the Sides 5 So is the Co- tangent of half the Vertical Angle, To the Tangent of half the Sum of the Angle. COROLLARIES. In any Spherical Triangle, t Tan. f Bafe : Tan. f Sum or the... ## A Treatise on Plane and Spherical Trigonometry: Including the Construction ...

Enoch Lewis - Conic sections - 1844 - 240 pages
...lined triangle, having two unequal sides ; as the less of those sides is to the greater, so is radius to the tangent of an angle ; and as radius is to the tangent of the excess of that angle above half a right angle, so is the tangent of half the sum of... 