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Lines

Parallel lines never intersect and have the same slope.
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Perpendicular lines intersect at 90 degrees. One line's slope is the opposite reciprocal of the other's.
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Two coplanar lines that intersect.
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Dotted lines represent hidden portions of the plane.
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Two planes intersect in a line.
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Any line that contains A and is on the plane is perpendicular to line AB.
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Line intersecting a plane at point A. The dotted portion of the line is occluded by the visible part of the plane.
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Angles formed by two lines cut by a transversal. The lines do not appear parallel in this diagram, but you are free to constrain them if needed.
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Geometry Expressions