Constructing triangles

A FULL LESSON on constructing triangles using a compass, protractor and ruler.
Full clear visuals animations for each construction.
Paperless lesson
Touchscreen lesson: TRIGGERED
Clicker lesson: CLICKER

Assumed prior knowledge:

  • Use of a compass and straight edge
  • Measuring an angle

We are learning about: Constructing triangles
We are learning to: Use a compass, ruler and protractor to construct triangles.

Differentiated objectives:

  • Developing learners will be able to construct SSS triangles.
  • Secure learners will be able to construct SAS and ASA triangles.
  • Excelling learners will be able to construct other polygons given angles and sides.

Starter: Gets straight ‘stuck in’ with an equilateral triangle.
Main: Worked through examples of SSS, SAS and ASA triangles with visual prompts and steps, followed by 8 practice questions displayed on board after each type of triangle.
Plenary/Extension: Constructing triangles with a scale, worded constructions, sectors and other polygons.

Please do leave feedback if downloaded! THANK YOU!


Save for later
  • 1.2a-Contructing-triangles-CLICKER.pptx
  • 1.2a-Contructing-triangles-TRIGGERED.pptx

About this resource


Created: Jan 28, 2019

pptx, 1 MB


pptx, 1 MB


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Creative Commons "Sharealike"

Creative Commons "Sharealike"