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The question asks which type of triangle a right-angled triangle **cannot** be. The options are:

- **A) Isosceles**
- **B) Scalene**
- **C) Equilateral**

### Answer:
A right-angled triangle **cannot** be **equilateral**.

### Explanation:
- **Isosceles:** A right-angled triangle can be isosceles if two of its sides are equal. In such a case, the angles opposite these sides would also be equal, but only one angle can be 90°.
  
- **Scalene:** A right-angled triangle can be scalene if all sides and all angles are different, with one angle being 90°.
  
- **Equilateral:** An equilateral triangle has all three sides equal and all angles equal to 60°. It's impossible for an equilateral triangle to have a 90° angle and still have all sides equal.

### Do you want more details or have any questions about this?

Here are five related questions to consider:
1. What are the properties of a right-angled triangle?
2. How can you determine if a triangle is isosceles, scalene, or equilateral?
3. What are some examples of right-angled triangles in real life?
4. How does the Pythagorean theorem relate to right-angled triangles?
5. Can a right-angled triangle have two 90-degree angles?

**Tip:** Always remember that in a right-angled triangle, one angle is always 90 degrees, which limits the possible types of triangles it can be.

A right-angled triangle cannot also be: A) Isosceles, B) Scalene, C) Equilateral

Explore why a right-angled triangle cannot be equilateral and learn the properties of different types of triangles. Understand the relationship between isosceles, scalene, and equilateral triangles in relation to right angles, ideal for students in Grades 6-8.

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