Question

Find the measures of two angles, one positive and one negative, that are coterminal with pi divided by five.

eleven pi divided by five; negative nine pi divided by five
pi divided by five + 360°; pi divided by five - 360°
six pi divided by five; negative four pi divided by five
eleven pi divided by five; negative pi divided by five

Answer 1

this might help you out: http://hotmath.com/hotmath_help/topics/coterminal-angles.html
for an explanation.