| A | B |
|---|
| polygon | a closed plane figure made up of line segments |
| side | each of the line segments of a polygon |
| vertex | the point where the sides of a polygon meet |
| triangle | a polygon with 3 sides |
| quadrilateral | a polygon with 4 sides |
| pentagon | a plane figure with 5 sides |
| hexagon | a polygon with 6 sides |
| octagon | a polygon with 8 sides |
| equilateral triangle | a triangle in which all sides are the same length |
| isoceles triangle | a triangle that has at least two equal sides |
| scalene triangle | a traingle in which no sides are the same length |
| right triangle | a triangle in which there is one right angle |
| acute triangle | a triangle with three acute angles |
| obtuse triangle | a triangle in which there is one obtuse angle |
| rectangle | a quadrilateral with 4 right angles |
| square | a quadrilateral with 4 right angles and all sides the same length |
| trapezoid | a quadrilateral with only one pair of parallel sides |
| parallelogram | a quadrilateral in which opposite sides are parallel |
| rhombus | a quadrilateral in which opposite sides are parallel and all sides are the same length |
