Year 3 - Maths
Investigate and draw other polygons with right angles
Right angles
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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 rotate 2 lines around a fixed point to make different angles. They identify vertices and describe half, quarter and three-quarter turns in terms of right angles.
Lesson Summary
You will learn to investigate right angles in shapes with more than four sides.
Key Notes
- Polygons with more than four sides can contain a right angle.
- Polygons with more than four sides can contain more than one right angle.
- Shapes can be drawn to match a description including angles and numbers of sides.
Vocabulary To Learn
- Pentagon: A 2D shape made up of five straight sides and vertices.
- Hexagon: A 2D shape made up of six straight sides and vertices.
Common Mistakes To Avoid
- Pupils may find it hard to recognise right angles presented in unusual orientations.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Polygons with more than four sides can contain a right angle. Polygons with more than four sides can contain more than one right angle.
2. Use this key word in a maths sentence and explain it clearly. 'Pentagon'
A 2D shape made up of five straight sides and 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 find it hard to recognise right angles presented in unusual orientations. Correction: Encourage pupils to continue to check angles with a right angle measurer. Teach them to recognise where vertices are clearly not right angles and differentiate these from ones that could be right angles.
More Lessons In This Unit
- Identify and describe right angles Study Guide
- Identify properties of quadrilaterals Study Guide
- Identify properties of triangles Study Guide
- Investigate the shapes made when rectangles are cut on the diagonal Study Guide
- Join four right angles at a point using different right-angled polygons Study Guide
- Know that a rectangle is a four-sided polygon with four right angles Study Guide
- Know that a right angle describes a quarter turn Study Guide
- Know that a square is a rectangle in which the four sides are of equal length Study Guide
- Make different sized angles by rotating two lines around a fixed point Study Guide
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