2. Basic Terms Coordinate Plane/Quadrants Clockwise: rotation in relation to the movement of a clock. Counter Clockwise: rotation opposite the movement of a clock.
3. A rose by any other name is a Radian Angles can be expressed in two ways: degrees and radians . A radian is the measure of a special central angle whose intercepting arc is the same as the circles radius. To convert degrees to radians: Multiply the degrees by π 180 Make sure π remains in that form!
4. Introduction to Unit Circles In order to find this out, we must use a Unit Circle. A unit circle is : On a coordinate plane with its center at origin With a radius of 1
5. Trigonometric functions on a unit circle! Sine and cosine can be seen on a unit circle as, coordinates, (x,y) What about tangent !? Well with triangles Tan is opp. over adj. In a unit circle tan is the SLOPE! Y = Sin X = cos
6. Reference Angles On a unit circle, angles can be made with one side starting from the x-axis and another side, the TERMINAL SIDE , which ends the angle A reference angle is the acute angle formed by the terminal side and the x-axis. They are formed through a counter clockwise rotation
7. Coterminal Angles Like reference angles, co terminal angles Are formed by terminal sides and the initial side.