| A | B |
|---|
| acute | A triangle with three angles less than 90 degrees |
| right | a triangle with one 90 degree angle |
| obtuse | a triangle with one angle over 90 degrees |
| scalene | a triangle with no equal sides |
| isosceles | a triangle with two equal sides |
| equilateral | a triangle with three equal sides |
| rhombus | a quadrilateral with four equal sides |
| rectangle | a quadrilateral with four right angles |
| square | a rectangle with four equal sides |
| parallelogram | a quadrilateral with two sets of parallel sides |
| trapezoid | a quadrilateral with on set of parallel sides |
