| A | B |
| acute | angle less than 90 degrees |
| angle | figure formed by two rays |
| degree | unit for measuring angles |
| equilateral | triangle with all the sides the same length |
| hexagon | six sided polygon |
| irregular | polygon with different side lengths |
| isosceles | triangle with two sides the same |
| obtuse | angles greater than 90 degrees |
| parallel | lines that never meet |
| parallelogram | quadrilateral with opposite sides parallel |
| polygon | closed figure made from straight lines |
| quadrilateral | four sided polygon |
| scalene | triangle with no sides equal |
| symmetry | two halves that mirror each other |
| tessellation | tiling a surface with no spaces |