The 30, 60, and 45 degree lines are the most frequently used ones in piecing.
I believe there are several "protractor" type rulers available. I have one - the only time I used it was to help my husband cut the correct angle for a picnic table leg. Table turned out very nice.
When talking angles, it is probably better to say a "correct" one than a "right" one, unless that "right" one is a 90 degree one.
I thought my 60,90, 30 triangle would work for Peaky and Spike, too. But Noooooo. Either draft the pieces or use the Bi-Rangle (I think) ruler.