The Essentials of Plane and Spherical Trigonometry

A'BC abscissa according acute angle adjacent angle bearing called characteristic circle circular colog computed convenient cos a cos cos x cos² cosine cotangent decimal definition Denoting determined difference distance Dividing equal EXAMPLES expressed figure find the values following triangles formulæ functions Geometry Given greater Hence hour included angle increases length less log csc log sin log tan logarithm manner mantissa measure middle miles multiply negative Note oblique triangles observation obtain opposite perpendicular plane positive produced prove quadrant ratio remaining respectively result right angle rule secant sides signs sin B sin sin x sin² sine solution Solve the following spherical triangle subtract supplement taken tanc tangent triangle ABC Trigonometry values Whence