Triangle Types | Worksheets - Free Printable

Let’s go step by step to classify each triangle based on its side lengths.

We are told:
- Equilateral triangles → all 3 sides equal → color them blue
- Isosceles triangles → at least 2 sides equal → color them green
- Scalene triangles → all 3 sides different → color them red

Now let’s look at each labeled triangle (a through f) and check their side lengths:

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Triangle a:
Sides: not labeled with numbers, but it’s colored red and labeled “scalene” — so we assume it has 3 different sides.
→ Scalene → Red ✔

Triangle b:
Colored blue, labeled “equilateral” — so all sides must be equal.
→ Equilateral → Blue ✔

Triangle c:
Colored green, labeled “isosceles” — so at least two sides equal.
→ Isosceles → Green ✔

Triangle d:
Colored red, labeled “scalene” — all sides different.
→ Scalene → Red ✔

Triangle e:
Colored green, labeled “isosceles” — at least two sides equal.
→ Isosceles → Green ✔

Triangle f:
Colored red, labeled “scalene” — all sides different.
→ Scalene → Red ✔

Wait — actually, looking again at the image, the coloring is already done! The task says:

> Color the equilateral triangles blue.
> Color the isosceles triangles green.
> Color the scalene triangles red.

And in the image, each triangle is already colored and labeled correctly underneath.

So for example:
- Triangle b is blue → equilateral → correct.
- Triangles c and e are green → isosceles → correct.
- Triangles a, d, f are red → scalene → correct.

But wait — let’s double-check if any of these might be misclassified.

Actually, since this is a worksheet where the student is supposed to color them, and the image shows the *completed* version, then the answer is just confirming what’s shown.

However, if we’re solving it from scratch without relying on the colors, we’d need side lengths. But in this image, only some triangles have side lengths given (like in other parts of the worksheet), but for triangles a–f, no side lengths are written — they’re just shapes with colors and labels.

That means: the worksheet is designed so that you visually identify or use the label under each triangle to know which type it is, then color accordingly.

Since the instruction is to “color” them, and the image already shows them colored correctly, the final answer is simply listing how each should be colored based on its type.

But perhaps the question is asking us to verify or state the correct classification for each lettered triangle.

Looking again:

In the “Classifying Triangles” box:

- a. → scalene → red
- b. → equilateral → blue
- c. → isosceles → green
- d. → scalene → red
- e. → isosceles → green
- f. → scalene → red

All match the coloring instructions.

So if the student is being asked to fill in the colors or confirm the classifications, here’s the correct assignment:

Final Answer:
a. red
b. blue
c. green
d. red
e. green
f. red