| A | B |
|---|
| a line dividing a shape into two matching halves | line of symmetry |
| a six-sided figure | hexagon |
| a polygon with all sides and angles congruent | regular ploygon |
| a quadrilateral with opposite sides parallel | parallelogram |
| a simple closed figure fromed by three or more sides | polygon |
| a ruler or any object with a straight side | staightedge |
| the point where two edges of a polygon intersect | vertex |
| the most common unit of measure for an angle | degree |
| an angle whose measure is between 0 and 90 degrees | acute angle |
| an angle whose measure is between 90 and 180 degrees | obtuse angle |
