Well this triangles angles have to add up to 180
If E is a perpendicular bisector with V so V= 90 degrees
and E=45 degrees
90+45=135 degrees
180 degrees -135 degrees =A) S = 45 degrees.
B) I conclude VES is a isoceles triangle because it has two corresponding angles.
C) This is a complicated one lets work this out in the comment section...
D) Same as C