1. Reference Angles

2. The Reference Angle y
The reference angle is the angle made in the triangle closest to the origin   ’ x ’

3. Find the reference angley
Find the reference angle for 288
Draw 288 angle
Draw triangle back to x axis
Find reference angle  x ’
’ is what is left over from 360
360 – 288 = ’
= 72

4. Find the reference angley
Find the reference angle for 98
Draw 98 angle
Draw triangle back to x axis
Find reference angle  ’ x
’ is what is left over from 180
180 – 98 = ’
= 82

5. Find the reference angley
Find the reference angle for -55
Draw -55 angle
Draw triangle back to x axis
Find reference angle x ’ 
’ is what is the same as measured from zero but the positive angle
|-55| = ’
= 55