Reference Angles

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

Find the reference angle y 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

Find the reference angle y 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

Find the reference angle y 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