Types of triangles based on sides

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A triangle can be drawn with different measures of sides and these sides determine the kind of triangle formed.


Recognize the triangles based on the measures of the sides

Estimated Time

30 minutes

Prerequisites/Instructions, prior preparations, if any

Prior knowledge of point, lines, angles, elements of triangle

Materials/ Resources needed

Download this geogebra file from this link.

Process (How to do the activity)

  • Students should recognize the elements of a triangle – sides and angles.
  • What are the measures of the sides of a triangle, are the measurements of the sides equal or different.
  • Establish that different triangles are formed with the different measures of the sides: when all sides are different, when any two sides are equal and when all sides are equal.
  • Children can note the measures of the sides in the worksheet for different triangles to conclude the type of triangles based on the sides.
  • Is the triangle formed for any measure of the sides. When does the triangle not form. What is the relation between the 3 sides for the triangle to be formed.
Observation Side 1 Side 2 Side 3 What can you say about sides? Type of triangle formed
Triangle 1
Triangle 2
Triangle 3
  • Evaluation at the end of the activity
  • Are children able to recognize the types of triangles when the sides are specified.
  • Have children been able to conclude when a triangle is formed given the three sides.