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.

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