| A | B |
|---|
| circle | a plane figure that has all its points the same distance from a center point |
| radius | any line segment with its endpoints at the center of the circle and on the circle |
| diameter | any line segment that passes through the center of the circle and has both endpoints on the circle |
| polygon | any closed plane figure formed by connected lines that do not cross |
| vertex | where two sides of a polygon meet |
| octagon | polygon with 8 sides - 8 vertices |
| hexagon | polygon with 6 sides - 6 vertices |
| pentagon | polygon with 5 sides - 5 vertices |
| quadrilateral | a polygon with 4 sides - 4 vertices |
| right triangle | a triangle with one right angle |
| equalateral triangle | a triangle with 3 sides the same length |
| parallelogram | has opposite sides parallel and the same length |
