# classifying triangles

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Curipod lesson about topic "classifying triangles"

1. Word cloud
120 seconds
What type of triangle has three equal sides?
2. Slide
60 seconds
Triangles have three sides and three angles. Triangles can be classified by their sides or angles. Knowing how to classify triangles helps us understand their properties.
Classifying Triangles
3. Slide
60 seconds
Equilateral Triangle: A triangle with all sides equal in length. Isosceles Triangle: A triangle with two sides equal in length. Scalene Triangle: A triangle with all three sides having different lengths.
Concepts:
4. Slide
60 seconds
The first use of the word “triangle” was in a book written by Euclid, an ancient Greek mathematician, around 300 BCE. The sum of the angles of a triangle is always 180°, no matter the size or shape. The area of a triangle can be calculated using Heron’s Formula, which is named after an ancient Greek mathematician.
Fun facts:
5. Open question
660 seconds
Work together in pairs: Which type of triangle did you find the most interesting to learn about during this lesson? Explain why.
6. Open question
660 seconds
Work together in pairs: What are the three main ways to classify a triangle?
7. Drawings
450 seconds
Brain break: Draw a self-portrait of yourself as a superhero!
8. Poll
300 seconds
What type of triangle has three sides that are equal in length?
• Scalene
• Isosceles
• Equilateral
• Right
9. Poll
300 seconds
What type of triangle has two sides that are equal in length?
• Scalene
• Isosceles
• Equilateral
• Right
10. Poll
300 seconds
What type of triangle has three angles that are equal in measure?
• Scalene
• Isosceles
• Equilateral
• Right
11. Poll
300 seconds
What type of triangle has one angle that is 90 degrees?
• Scalene
• Isosceles
• Equilateral
• Right
12. Poll
300 seconds
What type of triangle has two angles that are equal in measure?
• Scalene
• Isosceles
• Equilateral
• Right