Classifying Triangles Worksheet: Identify each triangle as right, scalene, isosceles, or equilateral based on side lengths and angles.

Let’s go through each triangle one by one. We’re classifying them as right, scalene, isosceles, or equilateral.

Remember:
- Right triangle: has a 90° angle (marked with a small square).
- Scalene triangle: all sides are different lengths (no tick marks, or all different).
- Isosceles triangle: at least two sides are equal (marked with same number of ticks).
- Equilateral triangle: all three sides are equal (all sides have same tick marks — usually one tick on each side).

Now let’s look at each:

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Triangle 1: Two sides have one tick mark → those two sides are equal → isosceles

Triangle 2: Has a right angle symbol → right

Triangle 3: All three sides have one tick mark → all sides equal → equilateral

Triangle 4: No tick marks, no right angle → all sides different → scalene

Triangle 5: Two sides have one tick mark → two sides equal → isosceles

Triangle 6: Has a right angle symbol → right

Triangle 7: Has a right angle symbol → right

Triangle 8: Two sides have one tick mark → two sides equal → isosceles

Triangle 9: Two sides have one tick mark → two sides equal → isosceles

Triangle 10: All three sides have one tick mark → all sides equal → equilateral

Triangle 11: No tick marks, no right angle → all sides different → scalene

Triangle 12: Two sides have one tick mark → two sides equal → isosceles

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Final Answer:
1. isosceles
2. right
3. equilateral
4. scalene
5. isosceles
6. right
7. right
8. isosceles
9. isosceles
10. equilateral
11. scalene
12. isosceles