Year 3 - Maths
Identifying parallel lines
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 identify parallel lines and extend lines in polygons to determine if sides are parallel.
Key Notes
- If you extend the side of a shape beyond the shape you can identify parallel and perpendicular lines.
- Lines are parallel because they are always the same distance apart.
Vocabulary To Learn
- Parallel: Parallel lines are straight lines that are always the same distance apart. They never get closer together or further apart.
Common Mistakes To Avoid
- Children may overgeneralise that parallel lines can only come in pairs or must be horizontal or vertical in orientation.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
If you extend the side of a shape beyond the shape you can identify parallel and perpendicular lines. Lines are parallel because they are always the same distance apart.
2. Use this key word in a maths sentence and explain it clearly. 'Parallel'
Parallel lines are straight lines that are always the same distance apart. They never get closer together or further apart. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may overgeneralise that parallel lines can only come in pairs or must be horizontal or vertical in orientation. Correction: These misconceptions are addressed in the lesson. You may wish to use these to create additional examples and non-examples to compare and share.
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
- 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 and draw triangles on circular geoboards Study Guide
- Make shapes by joining two polygons in different ways Study Guide
Browse all guides in the Year 3 Maths guide library.