| A | B |
|---|
| acute triangle | 3-sided polygon with three angles whose measures are less than 90 degrees |
| obtuse triangle | 3-sided polygon with one angle whose measure is greater than 90 degrees |
| isosceles triangle | 3-sided polygon with at least two conguent sides |
| right triangle | 3-sided polygon with one 90 degree angle |
| equilaterial triangle | 3-sided polygon with 3 congruent sides |
| scalene triangle | 3-sided polygon with no congruent sides |
| triangle | 3-sided polygon |
| isosceles right triangle | 3-sided polygon with two congruent sides and one 90 degree angle |
