In trigonometry, the trigonometric ratios are used to determine the value of the trigonometric functions of the angles of a right triangle.
The trigonometric ratios is commonly called SOH-CAH-TOA, according to the formulas used to obtain then.
Given a right triangle with angles A, B and C and sides 17, 8 and 15.
Since, the denominator of the given ratio is 15, which is not the hypothenuse (the slant side), thus, the trigonometric function is neither sin nor cos but tan, thus we look for the angle which the side of length 15 is the adjacent side. The required angle is B.
Therefore, 8/15 represent tan B.
