| A | B |
|---|
| Polygon | a closed figure made up of at least 3 straight sides |
| Quadrilaterals | a polygon with 4 sides |
| Parallelogram | A quadrilateral with two pairs of parallel sides and two pairs of congruent sides |
| Rectangle | A quadrilateral with two pairs of parallel and congruent sides and 4 right angles |
| Square | a quadrilateral with four congruent sides and four right angles |
| Rhombus | A quadrilateral with all sides congruent and two pairs of parallel sides |
| Trapezoid | A quadrilateral with exactly one pair of parallel sides |
| Octagon | an eight sided polygon |
| Triangle | a three sided polygon |
| Equilateral triangle | A triangle with 3 equal sides and angles |
| Isosceles Triangle | A triangle with at least 2 sides congruent |
| Scalene | A triangle with no equal sides |
| Face | surface of a plain figure (side) |
| Vertex | the point that the two rays of an angle have in common (corner) |
| Right Angle | an angle that measures exactly 90 degrees |
| Acute Angle | An angle that measures less than 90 degrees |
| Obtuse | An angle that measures more than 90 degrees |
| Point | an exact location on a line or line segment |
| Line | a straight path that continues forever in both directions |
| Line segment | Part of a line that extends from one point to another |
| Parallel Lines | Two lines that will never intersect |
| Intersecting lines | Two lines that cross each other |
| Line of Symmetry | A line a figure can be folded so that the 2 folds are the same |
| Perpendicular Lines | two lines that intersect and form right angles |
