Year 4 - Maths
Identify different types of triangle
Properties of 2D and 3D shapes and symmetry
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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 complete and compose symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes.
Lesson Summary
You will learn to identify different types of triangles and describe their properties.
Key Notes
- All triangles have 3 straight sides and 3 vertices.
- Equilateral triangles have 3 equal sides and 3 equal angles.
- Isosceles triangles have 2 equal sides and 2 equal angles.
- Scalene triangles have no equal sides and no equal angles.
Vocabulary To Learn
- Equilateral triangle: Equilateral triangles have 3 equal sides and 3 equal angles.
- Isosceles triangle: Isosceles triangles have 2 equal sides and 2 equal angles.
- Scalene triangle: Scalene triangles have no equal sides and no equal angles.
Common Mistakes To Avoid
- Some children may find it harder to recognise the type of triangle when they are drawn in different positions and orientations.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
All triangles have 3 straight sides and 3 vertices. Equilateral triangles have 3 equal sides and 3 equal angles.
2. Use this key word in a maths sentence and explain it clearly. 'Equilateral triangle'
Equilateral triangles have 3 equal sides and 3 equal angles. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Some children may find it harder to recognise the type of triangle when they are drawn in different positions and orientations. Correction: Allow time for children to manipulate the triangles so that they can see them in different orientations and build their understanding of the properties of each type of triangle.
More Lessons In This Unit
- Complete a symmetrical pattern Study Guide
- Diagonal lines of symmetry Study Guide
- Explore symmetry by joining two identical shapes Study Guide
- Explore, sort and classify triangles Study Guide
- Find lines of symmetry in 2D shapes Study Guide
- Investigate lines of symmetry in 2D shapes by folding Study Guide
- Investigate symmetry and symmetrical patterns Study Guide
- Reflect polygons in a line of symmetry Study Guide
- Reflect polygons that are dissected by the line of symmetry Study Guide
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