In case you did not realize it, but this is a math help site. We help students solve their math problems but we never would consider solving a problem for a student as this will not help them. If you had read the forum's guidelines you would have known this.

Hint: Why did you write 72 on the diagram? How many degrees all the way around?

between M and N, there is [MATH]x^o[/MATH], and between P and R, there is also [MATH]x^o[/MATH]
now, you should do the counting. sum of all of them [MATH]= \ ?[/MATH]