| A | B |
|---|
| midpoint | the point on a line segment that divides it into two equal, or congruent, parts |
| midpoint | .png) |
| bisector | a line or ray that divides an angle into 2 parts |
| bisector | .png) |
| linear pair | two adjacent angles that are supplementary |
| linear pair | .png) |
| perpendicular lines | Lines are perpendicular when they intersect at a (90degree) (right) angle |
| perpendicular lines | .png) |
| complementary angles | two angles whose sum is 90° |
| complementary angles | .png) |
| supplementary angles | two angles whose sum is 180 degrees |
| supplementary angles | .png) |
| congruent | identical in form |
| congruent | .png) |
| segment addition postulate | AB + BC = AC |
| segment addition postulate | .png) |
| angle addition postulate | if two adjacent angles form a larger angle, the sum of the measures of the two smaller angles is equal to the measure of the larger angle |
| angle addition postulate | .png) |
| substitution property | if x = y and x = z then y = z |
| reflexive property | x = x |
| symmetric property | AB = BA |
| transitive property | if x = y and y = z then x = z |
| addition/subtraction/multiplication/division property of equality | what you do to one side you do to the other side |
| right angles congruence theorem | all right angles are congruent |
| right angles congruence theorem | .png) |
| congruent supplements theorem | If two angles are supplementary to the same angle, then they are congruent |
| congruent supplements theorem | .png) |
| congruent complements theorem | if two angles are complements of the same angle, or of congruent angles, then those two angles are congruent |
| congruent complements theorem | .png) |
| vertical angles conguence theorem | when two lines intersect, the opposite angles formed (called vertical angles) are always congruent, meaning they have the same measure |
| vertical angles congruence theorem | .png) |
| linear pair postulate | if two angles form a linear pair, they are supplementary |
