Need help with some geometry thanks

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

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)?

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.