| A | B |
|---|
| A closed plane figure made of line segments. | polygons |
| A figure with three sides. | triangle |
| A figure with four sides. | Quadrilateral |
| A figure with five sides. | pentagon |
| A figure with six sides. | hexagon |
| A figure with eight sides. | octagon |
| All sides are the same length. | equilateral |
| P=4s | perimeter of a square |
| P=2l + 2w | perimeter of a rectangle |
| The formula for the circumference of a circle. | C=2d or r2Pi |
| Sides of a polygon | the line segments that form the polygon |
| vertex of a polygon | is an endpoint of a side of the polygon |
| convex | when no line that contains a side of the polygon contains a point in the interior of the polygon |
| concave | a polygon that is not convex |
| n=gon | polygon with n sides |
| equilateral | a polygon where all the sides are congruent |
| equiangular | a polygon where all the angles in the interior are congruent |
| regular | a oolygon where all the sides and angles are congruent |
| Pi times r squared | Area of a circle |
| s squared | area of a square |
| l times w | area of a rectangle |
| 1/2bh | area of a triangle |
| s+s+s | perimeter of a triangle |
