Summary
Sorts triangles by their sides and angles — equilateral, isosceles, scalene, and right, acute, obtuse. Builds vocabulary for classifying 2-D shapes.
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Teaching resources
Discussion questions
Talk about it
Triangles are grouped two ways: by their sides (equal or not) and by their angles (right, acute, or obtuse).
- What makes a triangle equilateral?
- How can you tell a right triangle from an acute triangle?
- Can a triangle be both isosceles and right? What would it look like?
Quick work-a-long
Vocabulary: equilateral, isosceles, scalene, right angle.
Try it: Draw one triangle with all equal sides and one with a right angle. Label each type.