HELPPP look at the picture I’m stuck on this

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

Me with this one question, and i'll upvote the brainliest answer

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.