| A | B |
|---|
| Triangle | has 3 sides. |
| Quadrilateral | has 4 sides. |
| Pentagon | has 5 sides. |
| Hexagon | has 6 sides. |
| Octogon | has 8 sides. |
| An equilateral triangle | has all 3 sides that are the same length. |
| An isosceles triangle | has two sides that are the same length. |
| A scalene triangle | has no two sides that are the same length. |
| A right triangle | has one right angle (90 degrees). |
| An acute triangle | has three acute angles. |
| An obtuse triangle | has one obtuse angle. |
| Parallelogram | Both pairs of opposite sides are parallel. |
| Square | All sides are the same length. There are four right angles. |
| Rectangle | Both pairs of opposite sides are parallel. There are four right angles. |
| Rhombus | Both pairs of opposite sides are parallel. All sides are the same length. |
| Trapezoid | There is only one pair of parallel sides. |
