Answer
$135^{o},\ 180^{o},\ 225^{o},\ 270^{o}$
Work Step by Step
If $0 \leq \theta < 360^{o}$ then
$0 \displaystyle \leq \frac{\theta}{3} < 120^{o},$
and $\displaystyle \theta=3(\frac{\theta}{3})$ so the corresponding values of $\theta$ are
$3(45^{o})=135^{o},$
$3(60^{o})=180^{o},$
$3(75^{o})=225^{o},$
$3(90^{o})=270^{o}.$
$135^{o},\ 180^{o},\ 225^{o},\ 270^{o}$
