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Geometry Terms LT 1

Vertical Angles Angles across from each other that are formed by two intersecting lines
Linear Pair Adjacent, supplementary angles
Adjacent Angles Angles that share a common side and vertex; angles next to each other
Right Angle This angle measures 90 degrees
Acute Angle The angle measures less than 90 degrees
Obtuse Angle This angle measures more than 90 degrees and less than 180 degrees.
Straight Angle This angle measures 180 degrees
Congruent Angles Any pair of angles that have the same measure
Collinear Points points that lie on the same line
Coplanar Points (at least 3) and lines in the same plane
Point a location in space
Plane a flat surface that has no thickness
Line Determined by 2 points. A series of points extending in opposite directions without end.
Segment Part of a line consisting of two endpoint sand all the points between them.
Ray The part of a line consisting of one endpoint and all the points on one side of the endpoint.
Opposite Rays Two collinear rays with the same endpoint, form a straight angle.
Angle Formed by two rays with the same endpoint. Named by three vertices.
Parallel Lines Coplanar lines that do nto intersect, have the same slope.
Perpendicular Lines Two lines that intersect at a right angle.
Skew Lines Noncoplanar lines that do not intersect.
Intersecting Lines Two lines meet at a point.
Complementary Angles Two angles whose measures add up to 90 degrees
Supplementary Angles Two angles whose measures add up to 180 degrees