Lesson - Reference Angles

Measure of Terminal side to closest x axis

Shortest distance to x axis

MUST  be < 90 degrees

MUST be Positive

The blue portion of graph is the original angle

The red portion is reference angle

Q1 - itself

Q2 - 180 Degrees minus the angle

Q3 -  The angle minus 180 degrees

Q4 - 360 minus the angle

Beta  β is our reference angle

Depending on Quadrant use the formulas

REMEMBER: Answer MUST be Positive and less than 90 !!