Reference Angles and Radian Measure

Front

What is the formula to convert degrees to radians?

Back

Radians = Degrees × (π/180)

Front

What is the reference angle for an angle in standard position?

Back

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

Front

What is 90 degrees in radians?

Back

π/2

Front

What is 180 degrees in radians?

Back

π

Front

What is the reference angle for 300 degrees?

Back

60 degrees

Front

What is the reference angle for 150 degrees?

Back

30 degrees

Front

What is 45 degrees in radians?

Back

π/4

Front

What is the reference angle for 330 degrees?

Back

30 degrees

Front

What is 270 degrees in radians?

Back

3π/2

Front

What is the reference angle for 210 degrees?

Back

30 degrees