Right angles (or 90 degrees).
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Actually there are 4 angles formed by 2 intersecting lines, and as long as the lines are PERPENDICULAR, the angles are all right angles, 90 degree each.
They are lines that intersect one another at 90 degree angles.
Perpendicular lines intersect at right angles which is 90 degrees
Perpendicular lines meet at right angles which is 90 degrees
If the lines are perpindicular then each pair of vertical angles are supplementary