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Lines and Angles
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Parallel
Two lines that are in the same plane and do not intersect, no matter how far they are extended.
Perpendicular
Two lines or segments which intersect at a right angle (90 degrees).
Skew
Lines that are non-coplanar and do not intersect each other.
Complementary Angles
Two angles whose sum is 90 degrees.
Supplementary Angles
Two angles whose sum is 180 degrees.
Acute Angle
An angle that is less than 90 degrees.
Obtuse Angle
An angle that is greater than 90 degrees but less than 180 degrees.
Vertical Angles
The pairs of opposite angles made by two intersecting lines.
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