PRECAL

Unit circle has a radius of __

• 1

• -1

• 0

• undefined

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• Q2

• Sin +

• Q4

• Tan +

• Q1

• Cos +

• Q3

• All +

Reference angle

• ø - 150

• ø = ø

• ø - 180

• 360 - ø

determined by rotating a ray about its endpoint

• Angle

• Arc

• Circle

• Scalene

Starting position : __

Position after rotation: __

• Initial Side : Terminal Side

• Terminal Side : Initial Side

Positive angles : __

Negative angles: __

• Counterclockwise : Clockwise

• Clockwise : Counterclockwise

Angles are labeled with Greek and lowercase letters

• True

• False

Answer explanation

Uppercase* letters

measure of central angle that intercepts an arc equal in length to the circle's radius

• Radian

• Radius

Two angles sum up equal to π/2 or 90°

• Complementary Angle

• Supplementary Angle

If you add two angles and the result is π or 180°, what type of angle is it?

• Complementary Angle

• Supplementary Angle