a is 75 and are vertical angle pairs
b is 90 alternate interior. match the boxed corner with the one they are asking
c is 112 and are called supplementary which means I add the side they gave me (68) to the side next to it (?) and it adds to 180 or a straight line
d is 119 and they are alternate interior angles. they are both inside the parallel lines and are switched up hence the name alternate (switched) interior (inside)
