Introduction to Trigonometry Angles and Radians (MA3A2): Define an understand angles measured in degrees and radians.

the rotating ray and the positive half of the x-axis angle

a positive angle whose vertex is at the center of a circle central angle

2 angles with a sum of 90 degrees complementary angles

2 angles in standard position that have the same terminal side coterminal angles

The beginning ray of an angular rotation; the positive half of the x- axis for an angle in standard position initial side

a clockwise measurement of an angle negative degree measure

Moving around a circle toward the right; a negative rotation Clockwise

a counterclockwise measurement of an angle positive degree measure

Opposite to clockwise; moving around the circle toward the left; a positive rotation counterclockwise

An angle in standard position with a terminal side that coincides with one of the four axes quadrantal angle

One of the 4 regions into which the x- and y-axes divide the coordinate plane quadrant

A unit of angle measure radian

The position of an angle with vertex at the origin, initial side on the positive x-axis, and terminal side in the plane standard position

2 angles with a sum of 180 degrees supplementary angles

The ending ray of an angular rotation; rotating ray terminal side