Isosceles, Equilateral, and Scalene Triangles worksheet | Live ... - Free Printable

Let’s go through each triangle one by one and look at the markings on the sides.

Remember:
- Equilateral = all 3 sides are equal (all have same number of tick marks)
- Isosceles = exactly 2 sides are equal (two sides have same tick marks, third is different or unmarked)
- Scalene = no sides are equal (all sides have different tick marks or none match)

Now let’s check each:

1) All three sides have one tick mark → all equal → Equilateral

2) Two sides have one tick mark, bottom side has no mark → two equal → Isosceles

3) No tick marks at all → we assume no sides are equal → Scalene

4) No tick marks → assume all sides different → Scalene

5) All three sides have one tick mark → all equal → Equilateral

6) Two sides have one tick mark, base has no mark → two equal → Isosceles

7) Two sides have one tick mark, third side has no mark → two equal → Isosceles

8) No tick marks → assume all sides different → Scalene

9) All three sides have one tick mark → all equal → Equilateral

10) No tick marks → assume all sides different → Scalene

11) Two sides have one tick mark, third side has no mark → two equal → Isosceles

12) All three sides have one tick mark → all equal → Equilateral

Final Answer:
1) Equilateral
2) Isosceles
3) Scalene
4) Scalene
5) Equilateral
6) Isosceles
7) Isosceles
8) Scalene
9) Equilateral
10) Scalene
11) Isosceles
12) Equilateral