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