Are two corners with common vertex opposite to vertex Tell me the reason 3Q~

Are two corners with common vertex opposite to vertex Tell me the reason 3Q~

No, the size must be equal

Two equal angles with a common vertex are opposite vertex angles

This is right

The correct description of vertex angle is that (a) has common vertex and equal angle (b) two lines intersect and have common vertex angle
The following description of vertex angle is correct: (a) the angle with common vertex and equal angle (b) two lines intersect, the angle with common vertex (c) the angle opposite to vertex (d) two lines intersect, two angles with common vertex and no common edge

D