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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