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A 2-dimensional plain polygon is called a 'DECAGON'.

Here are the names for 2-dimensional polygons, up to ten sides.

3 Trigon ( triangle)

4 Tetragon ( Quadrilateral)

5 Pentagon

6 Hexagon

7 Heptagon

8 Octagon

9 Nonagon

10 Decagon.

NB

The suffix '--gon' indicates a 2-dimensional figure.

The prefixes ' tri--- (etc))' are from their Latin roots.

NNB The suffix '---hedron- indicates a 3-dimensional object. . e.g. 'Tetrahedron'. a four sides 3-dimensional object. (commonly referred to as a 'triangular based pyramid).

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lenpollock

Lvl 16
1mo ago
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Wiki User

12y ago

A decagon.

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Q: What do you call 10 sided shape?
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