Unit Circle Values, Reference and Coterminal Angles

Front

What is the value of sin(90°) on the unit circle?

Back

1

Front

What is the value of cos(30°) on the unit circle?

Back

√3/2

Front

What is a reference angle?

Back

The acute angle formed by the terminal side of an angle and the x-axis.

Front

What is the reference angle for 277°?

Back

63°

Front

What is the value of sin(0°) on the unit circle?

Back

0

Front

What is the value of cos(0°) on the unit circle?

Back

1

Front

What is the value of sin(180°) on the unit circle?

Back

0

Front

What is the value of cos(90°) on the unit circle?

Back

0

Front

What is the reference angle for 150°?

Back

30°

Front

What is the reference angle for 210°?

Back

30°