Name That Polygon Free Printable Worksheet - Kidpid - Free Printable

Let’s solve this step by step.

We are asked to name each polygon based on how many sides it has. Polygons have special names depending on the number of sides. Let’s go one by one:

1. Four sides → A four-sided polygon is called a quadrilateral. But since all sides and angles look equal in the red shape, it’s specifically a square. However, the question just asks for the general name based on side count — so “quadrilateral” is correct. But wait — in elementary school, they often teach that 4 sides = quadrilateral, but sometimes they accept “square” if it looks like one. However, looking at the pattern below (5 sides = pentagon, etc.), we should use the standard geometric naming system:

- 3 sides = triangle
- 4 sides = quadrilateral
- 5 sides = pentagon
- 6 sides = hexagon
- 7 sides = heptagon
- 8 sides = octagon
- 9 sides = nonagon

But let’s check what’s commonly taught at this level. Often, for 4 sides, they might expect “quadrilateral”, but sometimes “square” if it’s clearly a square. However, the instruction says: “name these polygons according to the number of their sides”. So we should use the standard names based purely on side count.

Actually, let me double-check common curriculum:

- 4 sides → Quadrilateral (but sometimes “tetragon” is used technically, though rarely in schools)
- In most K–5 worksheets, they teach:
- 4 → quadrilateral
- 5 → pentagon
- 6 → hexagon
- 7 → heptagon (or septagon)
- 8 → octagon
- 9 → nonagon

Wait — I recall that some curricula simplify and say:

- 4 sides = square? No — because not all 4-sided shapes are squares. The red shape IS a square, but the category is “four sides”, so the answer should be the general term.

But looking at the other shapes: yellow is a regular pentagon, green is a regular hexagon, purple is a regular heptagon, blue is a regular octagon, cyan is a regular nonagon.

So the expected answers are likely the standard polygon names:

✔ Four sides → Quadrilateral
✔ Five sides → Pentagon
✔ Six sides → Hexagon
✔ Seven sides → Heptagon (sometimes called Septagon, but Heptagon is more standard)
✔ Eight sides → Octagon
✔ Nine sides → Nonagon

But wait — let me verify with common usage in such worksheets. Actually, in many elementary worksheets, for 4 sides, they may write “quadrilateral”, but sometimes they even accept “square” if it’s drawn as one. However, since the instruction says “according to the number of their sides”, we must use the name that corresponds to the side count, regardless of whether it’s regular or not.

Also, note: the first shape is labeled “Four sides” under a red square — so the blank is for the NAME of a polygon with four sides.

Standard answer key for such tasks:

- 4 sides → Quadrilateral
- 5 sides → Pentagon
- 6 sides → Hexagon
- 7 sides → Heptagon
- 8 sides → Octagon
- 9 sides → Nonagon

I think that’s solid.

Just to be 100% sure, let’s list them again:

Shape 1: Red square → 4 sides → Quadrilateral
Shape 2: Yellow pentagon → 5 sides → Pentagon
Shape 3: Green hexagon → 6 sides → Hexagon
Shape 4: Purple heptagon → 7 sides → Heptagon
Shape 5: Blue octagon → 8 sides → Octagon
Shape 6: Cyan nonagon → 9 sides → Nonagon

Yes, that matches standard geometry naming.

Final Answer:
Quadrilateral, Pentagon, Hexagon, Heptagon, Octagon, Nonagon