| A | B |
|---|
| right triangle | has a 90 degree angle |
| acute triangle | all angles are smaller than 90 degrees |
| obtuse triangle | one angle is larger than 90 degrees |
| scalene triangle | none of the sides and none of the angles are congruent |
| equilateral triangle | all sides and angles are congruent |
| Isosceles triangle | two sides and two angles are congruent |
| square | has four right angles and four congruent sides |
| rectangle | a parallelogram with four right angles |
