...side adjacent ~ O d. _ side adjacent _ OC, side opposite /?, C, hypotenuse _ O /?, side opposite 2?t C, These formulas serve as the definitions of the...apply to them some algebraic rules relating to signs. In Fig. 3, the hypotenuse used for the determination of the functions of A^ is any portion OB^ of the...

...In Fig. 3, if AB is 5 inches and BC is lj inches, what is the tangent of the angle A ? SOLUTION. — The tangent is the ratio of the side opposite to the side adjacent, or the ratio of BC to AB; hence, it is l|-^5 = 1.875-7-5 = .375. Ans. 14. Cotangent of Angle. — A...

...now ready to state the following definitions. The sine (abbreviated sin) of an acute (less than 90°) angle is the ratio of the side opposite to the hypotenuse. The cosine (abbreviated cos) of an acute angle is the ratio of the side adjacent to the hypotenuse. The...