Plane and Spherical Trigonometry and Mensuration

a. c. log altitude angle is equal arc increases base characteristic circular co-sine co-tangent complement corresponding cos b cos cosec decimal decreases denote diagonal diameter difference divided entire surface escribed circles Examples Find the angle find the area formulas fourth quadrant function Geometry Given gives greater Hence included angle increases increases from 90 increases numerically inscribed Introducing less logarithm measured minus natural negative one-half the sum opposite angle opposite side passes perpendicular plane polar polygon positive principles Problem proportion Proposition Prove pyramid radius reducing regular remaining required the area respectively right angle secant side adjacent sides sin b sin sine solution species sphere spherical triangle square Substituting supplement Tang tangent third triangle becomes values volume