Reference Angles

Front

What are the positive trigonometric ratios in Quadrant I?

Back

All the above (sin θ, cos θ, tan θ)

Front

What is the reference angle?

Back

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

Front

Find the cotangent of 120° using reference angles.

Back

-√3/3

Front

What is the reference angle for 125°?

Back

55°

Front

What are the positive trigonometric ratios in Quadrant IV?

Back

cos θ

Front

How do you find the reference angle for an angle in Quadrant II?

Back

Subtract the angle from 180°.

Front

How do you find the reference angle for an angle in Quadrant III?

Back

Subtract 180° from the angle.

Front

How do you find the reference angle for an angle in Quadrant IV?

Back

Subtract the angle from 360°.

Front

What is the reference angle for 210°?

Back

30°

Front

What is the reference angle for 300°?

Back

60°