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# Module Geometry

### All important words in geometry

Point A point is a location with no size or shape
Line A line is made up of points with no thickness or width
Line Segment A measurable part of a line consisting of 2 endpoints
Ray Part of a line that extends indefinitely in one direction
Plane A plane is a flat surface made up of points and expands indefinitely in all directions
Collinear Points that lie on the same line -- non-collinear; points that don't lie on the same lines
Coplanar Points that lie on the same plane -- non-coplanar; points that don't lie on the same plane
Congruent Segments If 2 segments have the same length then they are congruent
Segment Addition Postulate If A, B, and C are collinear points and B is between A and C, then Ab + BC = AC
Distance Formula The formula used to find the distance between the points on a coordinate plane d = square root of (x2 - x1)^2 + (y2 - y1)^2
Midpoint formula The formula used to mind the midpoint between 2 points M = (x1+x2/2, y1 +y2/2)
Segment Bisector A segment, line, ray; plane that intersects a segment at the midpoint
Perpendicular Two lines that intersect at a 90 degree angle (right angle) symbol is an upside down T
Perpendicular Bisector A line, segment, or ray perpendicular to a segment at its midpoint
Parallel Lines Two lines that never intersect symbol: ||
Angle Two rays with a common endpoint
Vertex The common endpoint of an angle
Right angle An angle with a measure of 90 degrees
Acute angle An angle with a measure less than 90 degrees
Obtuse angle An angle with a measure greater than 90 degrees
Straight angle An angle with a measure of 180 degrees
Congruent angles Two angles that have the same measure are congruent
Adjacent angles Two angles that share a vertex and a side
Angle addition postulate If angle ABD and angle DBC are adjacent, then measure of angle ABD + measure of angle DBC = measure of angle ABC
Angle bisector A line or ray that divides an angle into 2 "=" points
Vertical angles Two angles directly across from each other on intersecting lines *always congruent*
Complementary angles 2 angles with measures that sum to 90 degrees "don't have to be adjacent*
Supplementary angles 2 angles with measures that sum to 180 degrees "don't have to be adjacent*
Linear pair Adjacent angles that form a straight line, they are supplementary
An angle is formed by 2 ___ with a common endpoint rays
This common endpoint is called the ___ vertex
Name an angle using ___ letters 3
A ray that divides an angle into ___ _____ ____ 2 congruent angles
Two lines that _____ at a _____ ______ intersect right angle
A line, segment, or ray _______ to a segment is its ______ perpendicular midpoint
Created by: pandabear66*
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