Classifying Triangles

This lesson was contributed by:

Amanda Cilia

This lesson is for:

Lesson Duration:

60 mins.

What should you expect from this lesson?

This lesson will equip young mathematicians with the ability to classify triangles according to the length of their sides and the size of their angles. The focus will be on the equilateral triangle, scalene triangle, isosceles triangle and the right-angled triangle.

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How to carry out this lesson at home:

Resources:
• Types of triangles poster
• Handout – Toothpick Triangles
• Handout – Sorting Triangles

Lesson Description:
• Start off the lesson by going through the interactive PowerPoint Presentation (click HERE) to have a look at the different ways we can classify the equilateral, scalene, isosceles and right angled triangle. Ask the pupil to try the tasks outlined in the PowerPoint Presentation. If the pupil needs to go back to previous slides for reassurance and self-checking do allow him / her.
• Then press on this link to listen to the song to further consolidate the properties of these different triangles in a fun way.
• After show the pupil the ‘Types of Triangles’ poster (click HERE) and discuss what properties each triangle has. You can ask questions to set the pupil thinking. For example: What do they have in common? What differences can you see? Why is this an isosceles triangle?
• Next ask the pupil to use the online geoboard (click HERE).
• Ask the pupil to make an example triangle for each of the following triangles using the specified colour.
a. yellow: isosceles
b. red: scalene
c. green: equilateral
d. blue: right-angled
• Finally the pupil can try to work out the handout ‘Sorting Triangles’ (click HERE). The pupil has to cut out the triangles and sort into the correct place on the diagrams that follow. Through this final activity the pupil will be also rehearsing Venn Diagrams and Carroll Diagrams.

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