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.
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A right angle.
One, two or four right angles, depending upon whether one or both line segments continue beyond the point of intersection.
A right angle.
A square has both parallel and perpendicular symmetry. It is composed of two sets of parallel lines that meet at perpendicular angles.
Right angles are formed by perpendicular lines. If the lines would extend, to make two intersecting lines.