Unit Circle Test Review

Front

What is the formula to convert degrees to radians?

Back

To convert degrees to radians, use the formula: radians = degrees × (π/180).

Front

Convert 150° to radians.

Back

150° = 5π/6 radians.

Front

What is a reference angle?

Back

A reference angle is the acute angle formed by the terminal side of an angle and the x-axis.

Front

What is the reference angle for 125°?

Back

The reference angle for 125° is 55°.

Front

How do you determine the quadrant of an angle?

Back

To determine the quadrant of an angle, check the angle's measure: 0° to 90° is Quadrant I, 90° to 180° is Quadrant II, 180° to 270° is Quadrant III, and 270° to 360° is Quadrant IV.

Front

In which quadrant is the terminal side of a 330° angle?

Back

The terminal side of a 330° angle is in Quadrant IV.

Front

What is the sine of an angle in the unit circle?

Back

The sine of an angle is the y-coordinate of the point on the unit circle corresponding to that angle.

Front

What is sin(11π/6)?

Back

sin(11π/6) = -1/2.

Front

What are the coordinates of the point on the unit circle at 150°?

Back

The coordinates are (-√3/2, 1/2).

Front

What is the cosine of an angle in the unit circle?

Back

The cosine of an angle is the x-coordinate of the point on the unit circle corresponding to that angle.