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Triangle Classification

Categories of triangles based on angle measurements or the number of congruent sides.

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Triangle Classification
Teacher Contributed

RWA Triangle Classification


Measuring and classifying triangles in the real world


  • Acute triangle
  • Obtuse triangle
  • Right triangle
  • Equilateral triangle
  • Isosceles triangle
  • Scalene triangle

Student Exploration

How many triangles can you identify and classify in the world around you?

To learn more got to


Extension Investigation

1. Students will identify triangles in their classroom or school and do a presentation on what they found. See an example here:

2. Each student will bring or take a photo of an acute, right, obtuse, equilateral,isosceles and scalene triangles. They will measure the triangle angles and sides using a protractor and a ruler.

Layering (optional)

Triangles Rap

Real World Triangles

Triangle Sort, Shapes http://www.crickweb.co.uk/ks2numeracy-shape-and-weight.html

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