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Geometric shapes formed from three or more straight lines (polygons) include:

3 sides

triangle

4 sides (quadrilaterals)

square (4 equal sides, right angles)

trapezoid (4 sides with only 1 set of parallel lines)

rectangle (4 sides with 2 sets of parallel lines)

rhombus (4 sides, 2 parallel pair)

5 sides - pentagon

6 sides - hexagon

7 sides - heptagon (rarely septagon)

8 sides - octagon

9 sides - enneagon (classically - nonagon)

10 sides - decagon

11 sides - hendecagon (classically - undecagon)

12 sides - dodecagon (classically - duodecagon)

13 sides - tridecagon or triskaidecagon

14 sides - tetradecagon

15 sides - pentadecagon

16 sides - hexadecagon

17 sides - heptadecagon

18 sides - octadecagon

19 sides - enneadecagon (nonadecagon)

20 sides - icosagon

*For a list of some other basic shapes, see the related link.

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