Trigonometry & Unit Circle Review

Front

What is the value of cos(π)?

Back

-1

Front

What is the radius of a unit circle?

Back

1

Front

True or False: The sine of any angle on the unit circle is the y-coordinate.

Back

True

Front

What are the coordinates of 60° on the unit circle?

Back

(1/2, √3/2)

Front

What is the value of cos(4π/3)?

Back

-1/2

Front

What is the definition of a unit circle?

Back

A circle with a radius of 1 centered at the origin (0,0) in the coordinate plane.

Front

What is the relationship between the angles and coordinates on the unit circle?

Back

The x-coordinate represents the cosine of the angle, and the y-coordinate represents the sine of the angle.

Front

What is the sine of 90°?

Back

1

Front

What is the cosine of 0°?

Back

1

Front

What are the coordinates of 30° on the unit circle?

Back

(√3/2, 1/2)