Geometry
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Perpendicular lines meet at right angles
Angles that are pairs of opposite and congruent lines formed by intersecting lines are intersections
intersecting lines * * * * * Non-perpendicular intersecting lines. Or else the angles would be right angles.
Lines that intersect right angles (ninety-degree angles) are described as perpendicular.
Vertical angles can be supplementary angles if the lines are perpendicular and then both of the vertical angles would be 90 digress.