which are vertical angles?
Vertical angles are a pair of non-adjacent angles formed by the intersection of two straight line. Vertical angles are located across from one another in the corners of the X formed by two straight lines. In the diagram at the right, lines m and n are straight: â 1 and â 2 are vertical angles. â 3 and â 4 are vertical angles. â 1 and â 3 are NOT vertical angles.