Question

Are 120 and -240 coterminal?

Answer 1

Coterminal A = A + k*360

To find a positive coterminal angle
A = -240
Coterminal A = -240 + 360
Coterminal A = 120

To find a negative coterminal angle
A = -240
Coterminal A = -240 - 360
Coterminal A = -600