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# GNHSGeo Chapter 1

### Ms. Dolan's Geometry Chapter 1 Vocab

TermDefinition
Point A dot labeled with one capital letter
Segment Has two points as endpoints, labeled with two capital letters with a bar above
Line A straight path that goes on forever in both directions, labeled with two capital letters with a line with arrows above or the word line with a lower letter
Collinear Three or more points on the same line
Non-collinear Three points not on the same line
Bisect The action of dividing a segment into two congruent parts. You can bisect an angle and make two congruent angles or you can bisect a segment and make two congruent segments.
Midpoint A midpoint is a point in the middle of a segment. It divides the segment into two congruent parts.
Between A point that is between, not necessarily in the middle, between two endpoints.
Ray A segment that extends forever in one direction. It is labeled with two capital letters and an arrow above.
Plane A 2D shape that is closed and consists of at least 3 non-collinear points. The most common example is a four sided shape.
Coplanar Two or more points that are on the same plane.
Non-Coplanar Two points or two lines that are not on the same plane.
Complementary Two angles that add to 90 degrees.
Supplementary Two angles that add to 180 degrees
Adjacent Angles Two angles that share a ray- a vertex and side
Vertical Angles Two angles that are NOT adjacent- they are across from each other and only share a vertex
Straight Angle An angle that equals 180 degrees
Created by: edolan