Geometry Worksheets | Polygons Worksheets - Free Printable

Let’s go step by step to identify each regular polygon.

A regular polygon is a shape with all sides equal and all angles equal. We name them based on how many sides they have:

- 3 sides → Triangle
- 4 sides → Quadrilateral (but for regular ones, we often say “square” if it’s 4-sided)
- 5 sides → Pentagon
- 6 sides → Hexagon
- 7 sides → Heptagon
- 8 sides → Octagon
- 9 sides → Nonagon
- 10 sides → Decagon
- 11 sides → Hendecagon (or sometimes called undecagon)
- 12 sides → Dodecagon

Now let’s count the sides for each numbered shape:

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1) Count the sides: 10 → Decagon

2) Count the sides: 7 → Heptagon

3) Count the sides: 9 → Nonagon

4) Count the sides: 9 → Nonagon

5) Count the sides: 5 → Pentagon

6) Count the sides: 5 → Pentagon

7) Count the sides: 7 → Heptagon

8) Count the sides: 10 → Decagon

9) Count the sides: 9 → Nonagon

10) Count the sides: 9 → Nonagon

11) Count the sides: 11 → Hendecagon

12) Count the sides: 8 → Octagon

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I double-checked each one by counting the edges carefully. All shapes are regular, so we just need to match side count to the correct name.

Final Answer:
1) Decagon
2) Heptagon
3) Nonagon
4) Nonagon
5) Pentagon
6) Pentagon
7) Heptagon
8) Decagon
9) Nonagon
10) Nonagon
11) Hendecagon
12) Octagon