First is slope, which is a ratio that compares how many units a line increases vertically (its rise) compared to how many units it increases horizontally (its run). Slope is calculated as rise divided by run. The sine function written as sin(x), and the cosine function written as cos(x), and the tangent function written as tan(x). Sides and angles that touch are described as adjacent. Every side has two adjacent angles. Sides and angles that don’t touch are described as opposite. For a right triangle, the side opposite to the right angle is called the hypotenuse. The two remaining sides are called legs. The tangent of angle A = the length of the opposite side divided by the length of the adjacent side The sine of angle A = the length of the opposite side divided by the length of the hypotenuse The cosine of angle A = the length of the adjacent side divided by the length of the hypotenuse ---