Math I Chapter 7 Vocab

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Point
Indicates a location and has no size.
Line
Represented by a straight path that extends in two opposite directions without end.
Plane
Represented by a flat surface that extends without end and has no thickness.
Collinear Points
Points that lie on the same line.
Coplanar
Points and lines that lie in the same plane.
Segment
Part of a line that has two endpoints and all points between them.
Ray
Part of a line that has one endpoint.
Opposite Rays
Two rays that share the same endpoint and form a line.
Postulate
Accepted statement of fact.
Midpoint
A point that divides the segment into two congruent segments.
Congruent Segments
Segments with the same measure.
Angle
Formed by two rays with the same endpoint.
Vertex of an Angle
The endpoint of the angle where the rays meet.
Acute Angle
An angle who has a measure: 0 < x < 90°.
Right Angle
An angle that has the measure of 90°.
Obtuse Angle
An angle who has a measure: 90° < x < 180°.
Straight Angle
An angle with a measure of 180°.
Congruent Angles
Angles with the same measure.
Adjacent Angles
Coplanar angles with a common side, common vertex, and no common interior points (next to each other).
Vertical Angles
Two angles whose sides are opposite rays (across from each other).
Complementary Angles
Two angles whose measures have a sum of 90°.
Supplementary Angles
Two angles whose measures have a sum of 180°.
Linear Pair
Two adjacent angles with noncommon sides as opposite rays and are supplementary.
Angle Bisector
Ray that divides an angle into two congruent angles.
Protractor
An instrument that measures angles.