| A | B |
|---|
A closed plane figure formed by three or more sides (segments)., 
| polygon |
| A polygon wherein all sides and angles have equal measure | regular polygon |
| a four sided polygon | quadrilateral |
| a quadrilateral that has exactly 1 pair of parallel sides. | trapezoid |
| A quadrilateral that has 2 pairs of parallel sides | parallelogram |
| a quadrilateral that has 4 right angles | rectangle |
| a quadrilteral that has 4 congruent sides | rhombus |
| a quadrilaterl that has 4 congruent sides and 4 right angles. | square |
| a polygon with three sides | triangle |
| a triangle with all angles less than 90 degrees | acute triangle |
| a triangle with one right angle | right triangle |
| a triangle with one angle greater than 90 degrees | obtuse triangle |
| A regular triangle | equilateral triangle |
| a triangle with at least two sides congruent | isosceles triangle |
| a triangle with no sides congruent | scalene triangle |
| The angle measures of a triangle in a plane add to 180 degrees | triangle sum theorem |
