Year 3 - Maths
Make and draw triangles on circular geoboards
Parallel and perpendicular sides in polygons
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will investigate ways to compose and decompose polygons. They will investigate quadrilaterals with and without parallel and perpendicular sides.
Lesson Summary
You will learn to make and draw triangles on circular geoboards.
Key Notes
- 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.
Vocabulary To Learn
- 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 Mistakes To Avoid
- Pupils may overgeneralise about the way a triangle should look e.g. not recognising a scalene triangle as a triangle.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Three points on a geoboard can be joined to make a triangle. Triangles can have different properties.
2. Use this key word in a maths sentence and explain it clearly. 'Vertex / vertices'
A vertex is the point where two lines meet. The plural is vertices. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may overgeneralise about the way a triangle should look e.g. not recognising a scalene triangle as a triangle. Correction: 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.
More Lessons In This Unit
- Construct quadrilaterals with and without parallel and perpendicular sides Study Guide
- Draw polygons on isometric paper Study Guide
- Draw shapes with given properties Study Guide
- Draw shapes with given properties on a range of geometric grids Study Guide
- Identifying parallel lines Study Guide
- Investigate different ways of decomposing a polygon Study Guide
- Make and draw quadrilaterals on circular geoboards Study Guide
- Make and draw shapes with and without parallel and perpendicular sides Study Guide
- Make shapes by joining two polygons in different ways Study Guide
Browse all guides in the Year 3 Maths guide library.