Yes opposite angles are equal
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Perpendicular lines form right angles when they intersect.
A square or maybe a rectangle because their sides are perpendicular and their angles form 90 degree angles
By definition, any lines/segments that are perpendicular to each other either do, or (in the case of non-intersecting segments) would, intersect each other at right angles. A right angle being a 90* angle. Therefore, perpendicular, intersecting line segments will form 4 90* angles.
perpendicular lines
Perpendicular if they form right angles if not they form vertical opposite equal angles