angle between an horizontal line and the line of sight from an observer to a lower level

angle between a horizontal line and the line of sight from an observer to a higher object

the angle of rotation through which an object rotates about a center relative to its starting position

the change in the central angle with respect to time as an object moves along a circular path

For an acute angle of a right triangle, it is the ratio of the adjacent side to the hypotenuse.

angles with the same terminal side.

the fixed ray of an angle.

distance traveled per unit of time

has a terminal side on an axis.

the measure of a central angle whose sides intercept an arc that is the same length as the radius of the circle

the acute angle formed by the terminal side of an angle in standard position.

a region of a circle bounded by a central angle and the intercepted arc

For an acute angle of a right triangle, it is the ratio of the opposite side to the hypotenuse.

when an angle’s vertex is at the origin and its initial side is on the positive x-axis

For an acute angle of a right triangle, it is the ratio of the opposite side to the adjacent side.

the rotated ray of an angle.

has a radius of 1