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The Directed Angles

Two directed angles of 60 degrees and -300 degrees are not coterminal.

A directed angle of -90 degrees is equivalent to a directed angle of 270 degrees.

Two directed angles of -120 degrees and 240 degrees are coterminal.

Directed angles are always measured from the positive x-axis.

Directed angles can only be measured in degrees; radians are not used.

Directed angles are measured counterclockwise by convention.

Directed angles of 180 degrees are always negative.

A directed angle of 0 degrees is not equivalent to a directed angle of 360 degrees.

A directed angle of -45 degrees is equivalent to a directed angle of 315 degrees.

A directed angle of 270 degrees is equivalent to a directed angle of -90 degrees.