🌟 Triangle Detective 🌟 - Grade 6 Geometry

Hi my clever Grade 6 friends! 👋

Today we become Triangle Detectives! We will learn how to classify triangles in two important ways: by their sides and by their angles. Every triangle is special and belongs to different groups. Let’s investigate together! 🔎

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1. Classifying Triangles by Sides

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Equilateral Triangle

All 3 sides equal
All angles are 60°

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Isosceles Triangle

2 sides equal
2 angles equal

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Scalene Triangle

All sides different
All angles different

2. Classifying Triangles by Angles

Acute Triangle

All 3 angles are less than 90° (sharp angles)

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Right Triangle

One angle is exactly 90° (square corner)

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Obtuse Triangle

One angle is more than 90° (wide angle)

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3. Triangles Can Belong to Two Groups!

Examples:

✅ Equilateral triangles are always acute
✅ A Right-Isosceles triangle has two equal sides and one 90° angle
✅ Most scalene triangles are acute, right, or obtuse

4. Detective Practice Time! 🕵️‍♀️

Question 1

A triangle has sides 5 cm, 5 cm, and 5 cm. What kind is it?

Equilateral Triangle ⭐
All sides are equal!

Question 2

A triangle has angles 40°, 60°, and 80°. Classify by angles.

Acute Triangle ⭐
All angles are less than 90°

Question 3

A triangle has sides 6 cm, 8 cm, 10 cm and one 90° angle. What is it?

Right Scalene Triangle ⭐
(All sides different + one right angle)

5. Triangles in Real Life 🇨🇦

• Roof shapes of houses
• Road signs (yield sign is equilateral!)
• Bridges and trusses
• Sailing boats and hockey rink markings

You are now an Official Triangle Detective! 🌟

Great work today! You can now look at any triangle and tell exactly what kind it is.

Keep your eyes open — triangles are everywhere!

Love and big high-fives,
Mrs. Brenda ❤️

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