| A | B |
|---|
| Acute triangle | A triangle with all three angles less than 90 degrees |
| Equilateral triangle | This triangle has 3 congruent angles and 3 congruent sides |
| Isosceles triangle | This triangle has at least 2 congruent sides and 2 congruent angles |
| Scalene triangle | This triangle has no congruent sides and no congruent angles |
| Right triangle | This triangle has one right angle |
| Obtuse triangle | A triangle with one angle measuring greater than 90 degrees but less tahn 180 degrees |
| Triangle | A polygon with three sides |
| Supplementary angles | Two angles whose measure sum is 180 |
| Complementary angles | Two angles whose measure sum is 90 |
| Triangle Sum Theorem | This states that the angle measures of a triangle add up to 180 |
| Vertical angles | These angles are always congruent |
