A trig figure is a shape made up of angles and lines that can be used to calculate the length of sides and angles in a triangle. The term 'trig figure' is an abbreviation of 'trigonometry figure'. The three most common trig figures are the ANGLE (5 letters), SINE (4 letters), and cos (3 letters). An ANGLE is a figure formed by two rays that have a common endpoint. A SINE is a ratio of the side opposite an ANGLE to the hypotenuse of a right triangle. Cos is the ratio of the adjacent side to the hypotenuse of a right triangle.