Level 135
Level 137

#### 23 words 0 ignored

Ready to learn
Ready to review

## Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

**Ignore?**

Vertical Angles

Angles opposite one another when two lines intersect.

angles formed by parallel lines cut by a transversal #1

if 2 parallel lines are cut by a transversal, then the alternate interior angles formed are congruent

angles formed by parallel lines cut by a transversal #2

if 2 parallel lines are cut by a transversal, then the alternate exterior angles formed are congruent

angles formed by parallel lines cut by a transversal #3

if 2 parallel lines are cut by a transversal, then the corresponding angles formed are congruent

supplementary angles #1

supplementary angles from a straight line

supplementary angles #2

if 2 angles are congruent, then they're supplements are congruent

complementary angles #1

complementary angles form a right angle

complementary angles #2

if 2 angles are congruent, the they're complements are congruent

Perpendicular lines

lines in a plane that intersect to form 4 right angles

Right Angles

if 2 angles are right angles, then they're congruent

Midpoint

if a line segment has a midpoint, then the 2 segments formed are congruent

half segments

halves of congruent segments are congruent

half angles

halves of congruent angles are congruent

Bisector

if a line bisects a line segment, then it intersects it at its midpoint

bisector (converse)

if a line intersects a segment at its midpoint, then it bisected it

Perpendicular Bisector

if a line perpendicularly bisects a line segment, then it intersects it at its midpoint and forms right angles

Angle Bisector

if a line bisects an angle, then the 2 angles formed are congruent

Reflexive Property

a segment (or angle) is congruent to itself

Symmetric Property

when two segments or two angles are congruent, you can flip them over and they will still be congruent

Transitive Property

if two segments or two angles are congruent to the same segment of angle, they are congruent to each other

addition postulate

if congruent segments are added to other congruent segments, then the sums are congruent// if congruent angles are added to other congruent angles, then the sums are congruent

subtraction postulate

if congruent segments are subtracted from other congruent segments, then the differences are congruent// of congruent angles are subtracted from other congruent angles, then the differences are congruent

substitution postulate

a quantity may be substituted for its equal in any expression **ALWAYS USED TO GET THE ANSWER TO AN ADDITION/SUBTRACTION PROBLEM IN A PROOF**