They are of EQUAL size, and described as 'Vertically Opposite'.
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Yes. Perpendicular lines are intersecting lines, but they have right angles.
Opposite angles
More info needed. Are the 2 lines parallel, perpendicular, or? are the angles that you are interested in on opposite sides of the intersecting line or the same side. The intersecting line is called a transversal. If the original lines are parallel, angles between the 2 lines on opposite sides of the transversal are called alternate interior angles, etc.
perpendicular or orthogonal
perpendicular lines are a special type of intersecting line that happen to intersect at 90 degree angles