Perpendicular lines
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perpendicular to each other
They are equal opposite vertical angles and if the lines are perpendicular to each other then 90 degree angles are formed.
Two angles that are congruent to each other and are on opposite sides of the parellel lines
A heptagon contains zero parallel lines. All of the lines in a regular heptagon with all sides and angles equal are at different angles from each other.
cooresponding angles are created where a transversal crosses other (usually parallel) lines. the cooresponding angles are the ones at the same location at each intersection.