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What are some shapes that are geometric?

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2011-03-29 08:34:30

The names of common 2-dimensional geometrical shapes:

No straight sides

- circle (constant diameter)

- ellipse, oval (varying width)

Three or more straight lines (polygons) --

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

30 sides - tricontagon

1000 sides - chiliagon

10000 sides - myriagon

1000000 sides - megagon

(see the related link for more names)


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