An angle of 90 degrees.

Circle unit with radius.

Half the distance between the maximum in the minimum values of a sinusoid function.

The space in degrees between two intersecting line

Portion of time

An angle smaller than 90 degrees

Arc length of a circle of radius one.

The difference between the horizontal position of a function in that otherwise similar sinusoid function

X axis of an angle

Two angles in standard position that have the same terminal side

An angle greater than 90 degrees and less then 180 degrees

The angle subtended at the center of a circle by an arc that is equal in length to the radius

Sinusoidal graph

Distance traveled per unit of time

Equations involving trig functions of an angle that are true for any value of that angle

An angle of 180 degrees

Centeral angle that intercepts of an arc equal to the radius if the circle.

Anglw between the horizontal line of a sight and the line of sight down the object

Periodic

A trig identity expressing the pythagorean theorem in terms of trig functions

The positive acute angle that can represent an angle of any measure

A trigonometric function whose value for the complement of an angle is equal to the value of a trigonometric function of an angle itself

Y axis of an angle

Mathematics dealing with the relations of the sides and angles of triangles