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Trigonometric Functions Key Words • • • • • • • • • • • • • • • • Angle- A figure formed by 2 rays joined at their endpoints. Initial Ray- The starting side of the angle. Terminal Ray- The ending side of the angle. Standard Position- The initial ray of the angle lies on the positive x axis. Degree- One 360 th of a circle. Radian- The length of the arc on a circle equal to the radius of the circle. Coterminal- Angles that have the same initial ray and terminal ray. Unit Circle- A circle with a radius of one. Sine (sin)- The opposite over the hypotenuse. Cosine (cos)- The adjacent over the hypotenuse. Tangent (tan)- The opposite over the adjacent. Pythagorean Identity- (sin𝜽)2 + (cos𝜽)2 = 1 Intercepts- points where the graph touches an axis. Period- The measure of one complete, non-repeating cycle. Midline- The horizontal line through the center of the graph. Amplitude- The distance from the midline to the maximum or minimum point.