Classifying Triangles Worksheet | Download Free Printables For Kids - Free Printable

Let’s go through each triangle one by one and classify them based on their sides.

We’re looking at:
- Equilateral: All 3 sides are equal.
- Isosceles: Exactly 2 sides are equal.
- Scalene: All 3 sides are different.

Since we can’t measure the sides directly from the image, we’ll use visual judgment — if two sides look the same length, we’ll treat them as equal. If all three look different, it’s scalene. If all three look the same (rare in these worksheets), it’s equilateral.

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Row 1:

1a. Red triangle — looks like all sides are different → Scalene

1b. Blue triangle — two sides look equal (the left and right) → Isosceles

1c. Blue triangle — all sides look different → Scalene

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Row 2:

2a. Green triangle — two sides look equal (top and bottom) → Isosceles

2b. Red triangle — two sides look equal (left and right) → Isosceles

2c. Green triangle — all sides look different → Scalene

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Row 3:

3a. Blue triangle — two sides look equal (left and right) → Isosceles

3b. Red triangle — all sides look different → Scalene

3c. Green triangle — all sides look different → Scalene

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Row 4:

4a. Blue triangle — all sides look different → Scalene

4b. Green triangle — all sides look different → Scalene

4c. Red triangle — two sides look equal (left and right) → Isosceles

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Now let’s list them all clearly:

1a: Scalene
1b: Isosceles
1c: Scalene

2a: Isosceles
2b: Isosceles
2c: Scalene

3a: Isosceles
3b: Scalene
3c: Scalene

4a: Scalene
4b: Scalene
4c: Isosceles

Double-checking a few tricky ones:

- 1b: Looks symmetric — yes, isosceles.
- 2a: The two shorter sides look equal — isosceles.
- 3a: Vertical side vs slanted — actually, looking again, the two slanted sides look equal — still isosceles.
- 4c: Left and right sides look equal — isosceles.

All seem consistent.

Final Answer:
1a: Scalene, 1b: Isosceles, 1c: Scalene, 2a: Isosceles, 2b: Isosceles, 2c: Scalene, 3a: Isosceles, 3b: Scalene, 3c: Scalene, 4a: Scalene, 4b: Scalene, 4c: Isosceles