What is the radius of the unit circle?

The center of the unit circle lies at:

Which point lies on the unit circle?

The equation of the unit circle is:

On the unit circle, cos θ represents:

On the unit circle, sin θ represents:

What is the value of tan 45°?

Which quadrant contains angles between 90° and 180°?

In which quadrant are both sin θ and cos θ negative?

What is the value of sin 30°?

What is the radian measure of 270°?

What is the value of cos 60°?

Which trigonometric ratio is undefined at 90°?

The maximum value of sin θ is:

What is the value of sin 180°?

Which trigonometric ratio is always positive in the 4th quadrant?

The angle 330° lies in which quadrant?

Which of the following is NOT a quadrantal angle?

What is the radian measure of 90°?

Which angle has coordinates (−1, 0) on the unit circle?