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Unit 1-1 to 1-4

Pearson Geometry Unit i

TermDefinition
Collinear points points that lie on the same line.
Coplanar points and lines lie in the same plane.
Intersection the set of points the figures have in common.
Line a straight path that extends in two opposite directions without end and has no thickness; contains infinitely many points.
Opposite rays two rays that share the same endpoint and form a line.
Plane represented by a flat surface that extends without end and has no thickness; contains infinitely many lines.
Point indicates a location and has no size.
Postulate an accepted statement of fact.
Ray part of a line that consists of one endpoint and all points of the line on one side of the endpoint.
Segment part of a line that consists of two endpoints and all points between them.
Congruent segments Two segments that have the same length.
Coordinate the real number that corresponds to the location of a point.
Distance the absolute value of the difference of two point's coordinates.
Midpoint the point that divides a segment into two congruent segments.
Segment bisector a point, a line, a ray, or another segment that intersects a segment at its midpoint.
Acute angle an angle whose measure is between 0 and 90.
Angle formed by two rays with the same endpoint.
Congruent angles angles with the same measure.
Obtuse angle an angle whose measure is between 90 and 180.
Right angle – A right angle is an angle whose measure is 90.
Straight angle an angle whose measure is 180.
Vertex of an angle the common endpoint of the two rays that form the angle.
Created by: meminot