Classify Triangles Worksheet: Identify each triangle as acute, right, or obtuse by its angles.

Let's solve the "Classify Triangles Worksheet" by analyzing each triangle based on its angles. We classify triangles as:

- Acute: All three angles are less than 90°.
- Right: One angle is exactly 90° (a right angle).
- Obtuse: One angle is greater than 90°.

We will go through each triangle one by one and determine its classification.

---

1.

- Triangle: Looks like all angles are less than 90°.
- No right angle or wide angle visible.
- ✔ Answer: a. Acute

---

2.

- Triangle: Appears to have one angle that is exactly 90° (right angle) — it looks like a corner of a square.
- ✔ Answer: b. Right

---

3.

- Triangle: One angle appears to be greater than 90° (wide open angle).
- This is an obtuse triangle.
- ✔ Answer: c. Obtuse

---

4.

- Triangle: All angles appear to be less than 90°, no right or wide angle.
- Looks balanced and sharp.
- ✔ Answer: a. Acute

---

5.

- Triangle: All angles seem small, less than 90°.
- No right or obtuse angle visible.
- ✔ Answer: a. Acute

---

6.

- Triangle: One angle is clearly greater than 90° — very wide.
- This is an obtuse triangle.
- ✔ Answer: c. Obtuse

---

7.

- Triangle: One angle appears to be greater than 90° (open wide).
- Clearly an obtuse triangle.
- ✔ Answer: c. Obtuse

---

8.

- Triangle: Has one angle that is exactly 90° — forms a perfect corner.
- This is a right triangle.
- ✔ Answer: b. Right

---

✔ Final Answers:

1. a. Acute
2. b. Right
3. c. Obtuse
4. a. Acute
5. a. Acute
6. c. Obtuse
7. c. Obtuse
8. b. Right

---

🔍 Summary of Classification Rules:

- Acute: All angles < 90°
- Right: One angle = 90°
- Obtuse: One angle > 90°

You can visually estimate these by looking at the angles:
- If one angle "opens wide" → obtuse.
- If one angle looks like a square corner → right.
- If all angles look sharp and narrow → acute.

Let me know if you'd like this worksheet turned into a printable answer key!