Geometry Vocabulary

represents a location, has no width or thickness

has immeasurable length, no width or thickness, and is made up of infinite points, must have 2 points to define a line

part of a line with measurable length

part of a line with one endpoint and extends in one direction

a flat surface with width and length, but no thickness

3 points on the same line

points that lie on the same line

points that do NOT lie on the same line

points that lie in the same plane

points that do NOT lie in the same plane

lines in different planes that never intersect and are not parallel

equal in measure

a point that divides a segment into 2 congruent parts

a line that divides a segment/angle into 2 congruent parts

lines that never intersect

lines that intersect at right angles (90^o)

the intersection of 2 rays at a common endpoint (called a vertex)

measures less than 90^o

measures greater than 90^o and less than 180^o

measures 90^o

2 or more angles whose sum is 90^o

2 or more angles whose sum is 180^o

2 angles that share a common vertex and common ray

2 adjacent angles that are supplementary

angles with the same measure

2 angles formed by 2 intersecting lines "across from each other" and are congruent

a line that intersects 2 or more lines at different points

inside angles

outside angles

same position angles on different lines

any statement that can be written in IF-THEN form

the part in a Conditional Statement after the IF

the part in a Conditional Statement after the THEN

a statement that is accepted as true and applies to math in general

a statement accepted as true and applies to a specific branch of math (like Geometry)

a statement that can be proven true using terms, definitions, and postulates

switches the hypothesis and conclusion in a conditional statement