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Oak National Academy
Oak National Academy
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Year 3

Make and draw triangles on circular geoboards

I can make and draw triangles on circular geoboards.

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New
New
Year 3

Make and draw triangles on circular geoboards

I can make and draw triangles on circular geoboards.

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. Three points on a geoboard can be joined to make a triangle.
  2. Triangles can have different properties.
  3. Different triangles can be created on the same geoboard.

Common misconception

Pupils may overgeneralise about the way a triangle should look e.g. not recognising a scalene triangle as a triangle.

Throughout the lesson, model different triangles in different orientations. Ensure pupils see boundary examples such as scalene triangles with one very small acute angle, or long and thin isosceles triangles.

Keywords

  • Vertex / vertices - A vertex is the point where two lines meet. The plural is vertices.

  • Perpendicular - Two lines which meet at a right angle are perpendicular.

If you have practical geoboards then this is a good opportunity to make use of them. If these are not available consider making use of large printed geoboards to model examples.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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Starter quiz

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6 Questions

Q1.
Match the shape name to the number of vertices it has.
Correct Answer:Trapezium,4 vertices

4 vertices

Correct Answer:Hexagon,6 vertices

6 vertices

Correct Answer:Decagon,10 vertices

10 vertices

Q2.
Tick the shape which is a trapezium.
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q3.
True or false? These lines are parallel to one another.
An image in a quiz
Correct answer: True
False
Q4.
Complete the sentence. This polygon has pair(s) of parallel sides.
An image in a quiz
Correct Answer: 1, one
Q5.
The pentagon has been decomposed into two polygons which have the same name. What is the name of the polygon?
Correct Answer: quadrilateral
Q6.
Complete the sentence. A pair of sides meet to make a right angle.
Correct Answer: perpendicular

Exit quiz

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6 Questions

Q1.
Complete the sentence. This is a triangle and it has vertices.
An image in a quiz
Correct Answer: 3, three
Q2.
True or false: Alex has drawn a pair of perpendicular lines on this circular geoboard.
An image in a quiz
True
Correct answer: False
Q3.
Complete the sentence. This is a triangle and it has pair(s) of perpendicular sides.
An image in a quiz
Correct Answer: 0, zero
Q4.
Complete the sentence. This is a triangle and it has pair(s) of perpendicular sides.
An image in a quiz
Correct Answer: 1, one
Q5.
Select the statements that are true for this polygon drawn on a circular geoboard.
An image in a quiz
Correct answer: It is a triangle.
It is a quadrilateral.
It has one pair of perpendicular sides.
Correct answer: It has three equal sides.
It has one pair of parallel sides.
Q6.
Select the vertices that could be joined to form a right-angled triangle.
An image in a quiz
a, b and c
Correct answer: a, d and e
b, d and e

Additional material

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