| A | B |
|---|
| Isosceles Triangle | a triangle with two equal sides |
| Scalene Triangle | a triangle with no equal sides |
| Equilateral Triangle | a triangle with all equal sides |
| Right Triangle | a triangle with a right angle |
| Obtuse Triangle | a triangle with one obtuse and two acute angles |
| Acute Triangle | A triangle with all acute angles |
| Polygon | a 2D closed shape with all straight sides |
| Quadrilateral | a four-sided polygon |
| Parallelogram | a quadrilateral with two sets of parallel sides |
| Trapezoid | a quadrilateral with one set of parallel sides |
| Trapezium | a quarilateral with no parallel sides |
| Rectangle | a parallelogram with right angles |
| Rhombus | a parallelogram with equal length sides |
| Square | A parallelogram that is both a rectangle and a rhombus |
| Perimeter | the distance around a 2D figure |
| Area | the space inside (number of squares) a 2D figure |
