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Midpoint
A line segment is the point halfway between the endpoint of a segment.

Ray
 A part of a line
 Only has 1 endpoint
 Extends indefinitely in one direction.

Opposite Rays
Two rays going in opposite directions.

Angles
 Formed by 2 noncollinear rays
 2 rays = sides

Congruent Angles
 Angles that have the same measure.
 Arcs on the figures indicate which are congruent.

Bisector
A ray that divides an angle into 2 congruent angles.

Adjacent Angle
2 angles that lie in the same plane, have a common vertex, and a common side but does not share any interior points.

Verticle Angles
2 angles that are not adjecent and are formend when 2 lines intersect (cross).

Linear Pair
A pair of adjacent angles whose nocommon sides are opposite
*A linear pair will always sum up to 180°.

Complementary
Any 2 angles

Supplementary Angles
2 angles whose measure adds up to 180°.

Perpendicular Angle
Lines that intersect to form right angles.

