Question

Determine two coterminal angles (one positive and one negative) for each angle. give your answers in degrees. (enter your answers as a comma-separated list.) (a) 150° ° (b) −420°

Answer 1

To find positive coterminal angle we have to add 360 and to find negative coterminal angle, we have to subtract 360 degree.

a. 150 degree

Positive coterminal angle

$150+360= 510 degree$

Negative coterminal angle

$150-360=-210 degree$

b.-420 degree

Positive coterminal angle

$-420+2*360=300 degree$

negative coterminal angle

$-420-360 = -780 degree$