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# "Reason" Words

### Geometric Proof

TermDefinition
Bisect To cut down the middle, split in half, both smaller pieces are congruent.
Congruence The exact same
Definition of Congruence allows you to switch the sign between equal and congruence
Midpoint To cut down the middle, split in half, both smaller pieces are congruent.
Linear Pair two angles that are adjacent and supplementary. (two angles touching on a line)
Linear Pair Theorem If angles are a linear pair, then they are supplementary
Supplementary Adds to 180
Angle Addition Postulate the measure of the larger angle is the sum of the measures of the two smaller ones. (little plus little equals big)
Segment Addition Postulate the measure of the larger segment is the sum of the measures of the two smaller ones. (little plus little equals big)
Perpendicular lines Two lines that form 90 angles
Parallel Lines two lines that never intersect
Right Angles 90 degrees
Vertical Angles each of the pairs of opposite angles made by two intersecting lines (always congruent)
Substitution Replace one value with an equivalent value
Addition, Subtraction, Multiplication, Division Property of Equality The operation is performed on both sides of the equal sign
Reflexive Exact same on both sides of the equal or congruence sign
Symmetric Flip the equation around
Transitive If 2 things are equal to A, then the two things are equal to each other
Simplify Combine like terms or anything you can type into the calculator
Created by: cdyson