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# Ch.1 Geometry Vocab

### Basic Vocabulary for Chapter 1 of Geometry

point A location with neither shape nor size
line Made up of points and has no thickness or width
plane flat surface made up of points that extend infinitely in all directions
collinear points points that lie on the same line
coplanar points points that lie in the same plane
line segment Can be measured and has two endpoints
ray part of a line that extends infinitely in one direction
opposite rays two rays determined by a point on a line
intersection two or more geometric figures is the set of points that they have in common
postulate describes a fundamental relationship between the basic terms of geometry
distance between two points on a line length of the segment with those points as endpoints
angle formed by two noncollinear rays that have a common endpoint
acute angle angle measurement is less that 90 degrees
obtuse angle Angle measurement is over 90 degrees
right angle angle measurement is exactly 90 degrees
straight angle same as straight line; angle measurement is exactly 180 degrees
congruent angles two or more angles that measure the same length
supplementary angles Two angles with measures that have a sum of 180 degrees
angle bisector A ray that divides an angle into two congruent angles
complementary angles Two angles with measures that have a sum of 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
linear pair A pair of adjacent angles whose noncommon sides are opposite rays
vertical angles Two nonadjacent angles formed by two intersecting lines
polygon A closed figure formed by a finite number of coplanar segments called sides
convex polygon A polygon for which there is no line that contains both a side of the polygon and a point in the interior of the polygon
concave polygon A polygon for which there is a line containing a side of the polygon that also contains a point in the interior of the polygon.
n-gon A polygon with n sides
equilateral polygon A polygon with all equal sides
equiangular polygon A polygon with all angles that are equal
regular polygon A polygon with both sides and angles equal
Created by: Katrina1212