How do you simplify the square root of 180 and how do you know that it is in simplest form

Question 5 spring semester final exam math evaluate

Need on this one asap im almost done with this subject

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?