Question

Which of the following angles are coterminal to a 21 degree angle? Check all that apply.

Question 1 options:

741 degrees


381 degrees


-339 degrees


-21 degrees

Answer 1

741 deg, 381 deg, -339 deg

Explanation:

To find coterminal angles, add multiples of 360 degrees to an angle measure.

Multiples of 360: 0, -360, 360, -720, 720, -1080, 1080, -1440, 1440, etc.

21 + 360 = 381

21 + 720 = 741

21 - 260 = -339

21 - 720 = -699

Answer:

741 degrees YES

381 degrees YES

-339 degrees YES

-21 degrees NO