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# Geometry Vocab

### Chapter 1

two angles who share a common vertex and a side but have no common interior points Adjacent Angles
a ray that divides an angle into two angles that are congruent Angle Bisector
an angle that measures between 0 and 90 degrees Acute Angle
an angle that measures between 90 and 180 degrees Obtuse Angle
an angle that measures 90 degrees Right Angle
an angle that measures 180 degrees Straight Angle
points that lie on the same line Collinear
tool used to draw angles Compass
two angles whose sum of their measures equals 90 degrees Complementary/Complement
no line that contains a side of the polygon contains a point in the interior of the polygon Convex
points that lie on the same plane Coplanar
all sides are congruent Equilateral
not convex Concave
all angles are congruent Equiangular
Is equilateral and equiangular Regular
part of a line with two endpoints and all the points in between Line segment
part of a line with one endpoint and all the points on one side of the endpoint ray
two collinear rays with the same endpoint that form a line opposite rays
endpoints
two adjacent angles that have their noncommon sides form a line Linear Pair
the point that divides the segment into two congruent segments Midpoint
statements we accept to be true Postulate
tool used to measure the degree of angles Protractor
a point, ray, line, line segment, or plane that intersects the segment at its midpoint Segment Bisector
two angles whose sum of their measures is 180 degrees Supplementary/Supplement
statements we prove to be true Theorm
has no dimensions (size) Point
series of points without end Line
flat surface that extends in all directions in two dimensions without end Plane
initial point Vertex
two angles that sides form two pairs of opposite rays Vertical Angles
Distance Formula
Midpoint Formula
Congruent vs. Equal
if two segments have the same length *congruent
two rays with a common endpoint *angles
a closed figure that lies in a plane formed by three or more line segments *polygon
the distance between A and B is the absolute value of the difference between the coordinates A and B *ruler postulate
if B is between A and C then AB+BC=AC (sum of the parts is equal to the whole) *segment addition postulate
if P is the interior of angle RST then measure of angle RSP plus the measure of angle PST will equal the measure of angle RST (sum of parts is equal to whole) *angle addition postulate
Created by: 12tsherman