| A | B |
|---|
| parallel lines | 2 lines that never intersect |
| perpendicular lines | two lines that form four right angles |
| acute angles | angles less than 90 degrees |
| Obtuse angles | angles greater than 90 degrees but less than 180 degrees |
| straight angles | angles that measure 180 degrees |
| adjacent angles | angles that share a common vertex and common side (next to) |
| transversal | a line that intersects 2 or more other lines |
| alternate interior angles | angles on opposite side of the transveral and on the inside of the parallel lines/are congruent |
| alternate exterior angles | angles on opposite sides of the transveral, on the outside of the parallel lines/are congruent |
| corresponding angles | angles on the same side of the transversal, one on the inside, one on the outside, Big C, are congruent |
| scalene triangle | no equal sides |
| isosceles triangle | 2 sides are congruent |
| equilateral triange | all three sides are congruent |
| acute triangle | a triangle with 3 acute angles |
| obtuse triangle | a triangle with 1 obtuse angle |
| right triangle | a triangle with a right angle |
| right angle | an angle that measures 90 degrees |
| vertical angles | angles that are opposite/across from each other/are congruent |
