Geometry 1

Point

Indicates a location and has no size

Line

Represented by a straight path that extends in two opposite directions without end and has no thickness. Many Points.

Plane

Represented by a flat surface that extends without end and has no thickness. Many Lines.

Collinear Points

Point that lie on the same line

Coplanar

Points and lines that lie in the same plane

Segment

Part of a line that consists of two endpoints and all points between them

Ray

Part of a line that consists of one end point and all the points of the line on one side of the endpoint

Opposite Rays

Two rays that share the same endpoint and form a line

Mid-point

Point that divides a segment into two congruent segments

Vertex

The end point

Congruent Angles

Angles with the same measures

Adjacent Angles

Two coplanar angles with a common side, a common vertex, and no common interior points.

Vertical Angles

Two angles whose sides are opposite rays

Complementary Angles

Two angles have a sum of 90

Supplementary Angles

Two angles have a sum of 180

Linear Points

A pair of adjacent angles whose noncommon sides are opposite rays. The angles of a linear pair form a straight line.

Angle Bisector

Ray that divides an angle into two congruent angles