| A | B |
|---|
| Parallel | Lines in the same plane that do not intersect |
| Isosceles | A triangle with two congruent sides |
| 180 | The sum of the interior angles in a triangle |
| 45, 45, 90 | The angle measures in an isosceles right triangle |
| 60, 60, 60 | The angle measures in an equiangular triangle |
| Scalene | A triangle with no congruent sides |
| Perpendicular | Lines that intersect to form right angles |
| Alternate Interior | The official name of the angles that make a Z shape |
| Same-side interior | The official name of the angles that make a staple shape |
| Corresponding | The official name of the angles that make the L shapes |
| the angles are congruent | If alternate interior angles are formed by parallel lines, then... |
| the angles are supplementary | If same-side interior angles are formed by parallel lines, then... |
| Acute | A triangle with all three angles less than 90 |
| Equiangular | A triangle with three congruent angles |
| 30, 30, 120 | Possible angle measures for an obtuse isosceles triangle |
| 100, 30, 50 | Possible angle measures for an obtuse scalene triangle |
