Co-terminal and Reference Angles

Front

What is a reference angle?

Back

A reference angle is the acute angle formed by the terminal side of an angle in standard position and the x-axis.

Front

How do you find the reference angle for an angle greater than 360°?

Back

Subtract 360° from the angle until it is between 0° and 360°; then find the reference angle.

Front

What is the reference angle of 420°?

Back

60°.

Front

Back

Front

What is the reference angle of 120°?

Back

60°.

Front

How do you find a co-terminal angle?

Back

Add or subtract 360° (or 2π radians) to/from the given angle.

Front

What is the co-terminal angle of 150°?

Back

510°.

Front

What is the reference angle of 300°?

Back

60°.

Front

What is the relationship between co-terminal angles?

Back

Co-terminal angles share the same terminal side but differ by full rotations (360° or 2π radians).

Front

How do you convert degrees to radians?

Back