| Term | Definition |
|---|
| Conjecture | an educated guess based on observations |
| Counter example | an example that shows a conjecture is false |
| Congruent | figures with the same shape and size |
| Postulate | rules that are accepted without proof |
| Midpoint | the point that divides, or bisects, a segment into two congruent parts |
| Bisect | to divide into two congruent parts |
| Vertical | two angles whose sides form two pairs of opposite rays |
| Linear Pair | two adjacent angles who noncommon sides are opposite rays |
| Complementary | two angles whose measures sum to 90 degrees |
| Supplementary | two angles whose measures sum to 180 degrees |
| Adjacent | two angles that share a common vertex and side, but have no common interior points |
| Conditional Statement | has 2 parts, a hypothesis and a conclusion |
| Converse | statement formed by switching the hypothesis and conclusion of a conditional statement |
| Inverse | statement formed by negating the hypothesis and conclusion of a conditional statemtent |
| Contrapositive | statement formed by negating the hypothesis and conclusion of the converse statement |
| Perpendicular | two lines intersecting to form right angles |
| Biconditional | statement containing the phrase 'if and only if.' Equivalent to writing a conditional statement and its converse |
| Parallel | coplanar lines or planes that never intersect |
| Skew | lines that do not intersect and are not coplanar |
| isosceles | triangle with at least 2 congruent sides |
| scalene | triangle with no congruent sides |
| equilateral | triangle with 3 congruent sides |
| equiangular | triangle with 3 congruent angles, each 60° |
| acute | triangle with 3 acute angles, less than 90° |
| obtuse | triangle with 1 obtuse angle, more than 90° |
| right | triangle with 1 right angle, exactly 90° |
| congruent | same shape and size |
| corresponding | same position |
| alternate interior | angles inside the parallel lines on opposite sides of the transversal |
| transversal | line that intersects two or more coplanar lines at different points |
| alternate exterior | angles outside the parallel lines on opposite sides of the transversal |
| consecutive interior | angles inside the parallel lines on the same side of the transversal |
Combine with other sets
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