A line {transversal} can cross two coplanar lines, to form four angle pairs. Angles can orient in same direction {corresponding angle, transversal}. Angles {alternate angle} can lie on opposite sides of coplanar-line transversal. Angles can be opposite each other at intersection points {vertically opposite angle}.
Mathematical Sciences>Geometry>Plane>Line>Intersection
3-Geometry-Plane-Line-Intersection
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Date Modified: 2022.0224