New
New
Year 3
Make and draw triangles on circular geoboards
I can make and draw triangles on circular geoboards.
New
New
Year 3
Make and draw triangles on circular geoboards
I can make and draw triangles on circular geoboards.
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Lesson details
Key learning points
- Three points on a geoboard can be joined to make a triangle.
- Triangles can have different properties.
- Different triangles can be created on the same geoboard.
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.
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.
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 (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson 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.
4 vertices
6 vertices
10 vertices
Q2.
Tick the shape which is a trapezium.
Q3.
True or false? These lines are parallel to one another.
False
Q4.
Complete the sentence. This polygon has pair(s) of parallel sides.
Q5.
The pentagon has been decomposed into two polygons which have the same name. What is the name of the polygon?
Q6.
Complete the sentence. A pair of sides meet to make a right angle.
Exit quiz
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6 Questions
Q1.
Complete the sentence. This is a triangle and it has vertices.
Q2.
True or false: Alex has drawn a pair of perpendicular lines on this circular geoboard.
True
Q3.
Complete the sentence. This is a triangle and it has pair(s) of perpendicular sides.
Q4.
Complete the sentence. This is a triangle and it has pair(s) of perpendicular sides.
Q5.
Select the statements that are true for this polygon drawn on a circular geoboard.
It is a quadrilateral.
It has one pair of perpendicular sides.
It has one pair of parallel sides.
Q6.
Select the vertices that could be joined to form a right-angled triangle.
a, b and c
b, d and e
Additional material
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