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Geometry: Parallel Lines

Across
A line that intersects two or more coplanar lines at two different points.
Coplanar lines that intersect to form right angles.
Non-adjacent exterior angles that lie on opposite sides of a transversal. (two words)
Adjacent angles whose non-common sides are opposite rays. (two words)
Lines that do not intersect and are not coplanar.
Non-adjacent interior angles that lie on the same side of a transversal. Also known as same-side interior angles. (two words)
The ratio of the change along the y-axis to the change along the x-axis between any two points on a line.
Having equal measure.
Non-adjacent angles formed by intersecting lines; they have a common vertex.
Down
Non-adjacent interior angles that lie on opposite sides of a transversal. (two words)
Two angles whose measures sum to 180 degrees.
An extra line added to a figure.
The same distance.
Coplanar lines that do not intersect.
Non-adjacent angles, one interior and one exterior, that lie on the same side of a transversal.
Two angles whose measures sum to 90 degrees.
Formed by two rays with a common endpoint known as the vertex.