# How many sides does a triangle have?

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Curipod lesson about topic "Classifying Triangles". #5-7

1. Word cloud
120 seconds
How many sides does a triangle have?
2. Slide
60 seconds
Triangles are classified by their angles and side lengths. A triangle's angles can be acute, right, or obtuse. The sides of a triangle can be equal or different lengths.
Classifying Triangles
3. Slide
60 seconds
Acute Triangle: A triangle with three angles that are all less than 90°. Right Triangle: A triangle with one angle that is 90°. Obtuse Triangle: A triangle with one angle that is greater than 90°.
Concepts:
4. Poll
60 seconds
Do you think triangles are easy to classify?
• Yes
• No
• Sometimes
• I don't know
5. Slide
60 seconds
The longest side of an acute triangle is opposite the largest angle. The longest side of a right triangle is opposite the right angle. The longest side of an obtuse triangle is opposite the smallest angle.
Fun facts:
6. Drawings
450 seconds
Draw / write: What are the three different types of triangles?
7. Drawings
360 seconds
Draw / write: What is the difference between acute and obtuse triangles?
8. Open question
150 seconds
How did you decide which type of triangle each example was?
9. Open question
330 seconds
What strategies did you use to classify the different types of triangles?