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# Geo Ch 1 Definitions

### Geometry Chapter 1 Definitions

TermDefinition
Acute angle An angel with a degree measure less than 90 degrees.
Adjacent angles Two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.
Angle bisector A ray that divides an angle into two congruent angles.
Between For any two points "A" and "B" on a line, there is another point "C" between "A" and "B" if and only if "A", "B", and "C" are collinear and AC + CB = AB
Collinear Points that lie on the same line
Complementary angles Two angles with measures that have a sum of 90 degrees.
Coplanar Points that lie in the same plane
Line A basic undefined term of geometry. A line is made up of points and has not thickness or width. In a figure, a line is shown with an arrowhead at each end. Lines are usually named by lowercase script letters.
Linear pair A pair of adjacent angles whose non-common sides are opposite rays.
Midpoint The point halfway between the endpoints of a segment.
Obtuse angle An angle with degree measure greater than 90 degrees and less than 180 degrees.
Lines, segments, or rays are perpendicular iff they intersect to form a right angle.
Plane A basic undefined term of geometry. A plane is a flat surface made up of points that has no depth and extend indefinitely in all directions. A plane is represented by a shaded, slanted 4-sided figure.
Precision The precision of a measurement depends on the smallest unit available on the measuring tool.
Ray A ray is a part of a line. It has one endpoint and extends indefinitely in one direction. Rays are named stating the endpoint first and then any other point on the ray.
Regular Polygon A convex polygon in which all of the sides are congruent and all the angles are congruent.
Right angle An angle with a degree measure of 90.
Segment bisector A segment, line, or plane that intersects a segment at its midpoint.
Supplementary angles Two angles with measures that have a sum of 180 degrees.
Vertex The common endpoint of two rays or more.
Vertical angles Two nonadjacent angles formed by two intersecting lines.
Created by: m.meyer