# Vocabulary Words

### Assignment #1

## Vocab

**Radians- A unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius- A straight line from the center to the circumference of a circle or sphere.**

**Degrees- A unit of measurement of angles, one three-hundred-and-sixtieth of the circumference of a circle.**

**Initial Side- A stationary straight line that contains a point about which another straight line is rotated to form an angle **

**Terminal Side- An angle is in standard position if its vertex is located at the origin and one ray is on the positive x-axis.**

**Coterminal Angle- angles in standard position (angles with the initial side on the positive x-axis) that have a common terminal side. **

**Reference Angle- is the smallest angle between the terminal side and the x-axis.**

**Unit Circle- is a circle with a radius of one**

**Trig Ratios (Sine, Cosine, Tangent, Secant, Cosecant, Cotangent)- they areratios of two sides of a right triangle and a related angle.**