| 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 line segments | polygon |
| a ruler or any object with a straight side | staightedge |
| the origin point where two lines diverge | 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 |
| an angle whose measure is 90 degrees | right angle |
| a deviced used for measuring degress | protractor |
| two angles whose measure add up to 90 degrees | complementary |
| two angles whose measure add up to 180 degress | supplementary |
| part of a line that is defined by two points | segment |
| a five sided polygon | pentagon |
| an 8 sided polygon | octagon |
| a 3 sided polygon | triangle |
| divide something into two equal parts | bisect |
| a triangle with 2 equal sides | Isosceles |
| A triangle with no equal sides | Scalene |
| A triangle with three equal sides | Equilateral |
| two angles that share a common vertx and one side | adjacent |
| A triangle where on of the angles is 90 degrees | right triangle |
