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Vertical and horizontal lines are perpendicular.
Arrow marks indicate parallel lines.
A square angle symbol denotes 90°.
Such a line is called a transversal.
Four angles at each intersection make 8 angles.
Vertically opposite angles are equal, limiting distinct measures to 4.
Vertically opposite angles are equal.
Such angles are called corresponding angles.
Equal corresponding angles imply parallel lines.
Corresponding angles are equal for parallel lines.
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