📐 Part 1: Multiple Choice - Triangle Types

1. A triangle with all three sides equal is called:

Scalene

Isosceles

Equilateral

Right-angled

2. A triangle with two equal sides is called:

Scalene

Isosceles

Equilateral

Obtuse

3. A triangle with one angle measuring exactly 90° is called:

Acute triangle

Right triangle

Obtuse triangle

Scalene triangle

4. Which of these describes an obtuse triangle?

All angles are less than 90°

One angle is exactly 90°

One angle is greater than 90°

All angles are equal

🏷️ Part 2: Triangle Classification

5. Look at each triangle description and classify it by BOTH side lengths and angles:

Triangle A: Sides: 5cm, 5cm, 8cm | Angles: 45°, 45°, 90°

By sides: _____________ By angles: _____________

Triangle B: Sides: 6cm, 6cm, 6cm | Angles: 60°, 60°, 60°

By sides: _____________ By angles: _____________

Triangle C: Sides: 4cm, 7cm, 9cm | Angles: 30°, 50°, 100°

By sides: _____________ By angles: _____________

6. Draw and label examples in the boxes below:

Draw a scalene acute triangle:

Draw an isosceles right triangle:

✏️ Part 3: Short Answer Questions

7. Explain the difference between classifying triangles by sides and classifying them by angles:

8. Can a triangle be both isosceles AND right-angled? Give an example or explain why not:

9. True or False: An equilateral triangle is always an acute triangle. Explain your answer:

Triangle Classification Worksheet

Triangle Classification Worksheet

📐 Part 1: Multiple Choice - Triangle Types

🏷️ Part 2: Triangle Classification

✏️ Part 3: Short Answer Questions

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