Please help im struggling so much!

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)?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.