Year 7 - Maths
Reflecting objects
Transformations
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit introduces pupils to shape tranformations: enlargements, rotations, reflections and translations both by hand and with technology.
Lesson Summary
You will learn to reflect objects using a range of lines of reflection.
Key Notes
- The line of reflection may go through part of the object.
- The line of reflection may not touch the object.
- Tracing paper can be a useful tool for performing reflections.
Vocabulary To Learn
- Line of reflection: The line of reflection is the line about which an object is reflected. The object and image are equidistant from the line of reflection.
Common Mistakes To Avoid
- Diagonal reflections that incorrectly look like rotations or translations of the object.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The line of reflection may go through part of the object. The line of reflection may not touch the object.
2. Use this key word in a maths sentence and explain it clearly. 'Line of reflection'
The line of reflection is the line about which an object is reflected. The object and image are equidistant from the line of reflection. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Diagonal reflections that incorrectly look like rotations or translations of the object. Correction: False reflections that look like this are due to students not counting diagonals of grid squares, perpendicular to the mirror line.
More Lessons In This Unit
- Checking understanding of basic transformations Study Guide
- Describing a reflection Study Guide
- Describing a rotation's direction and size Study Guide
- Describing a translation Study Guide
- Describing an enlargement Study Guide
- Enlarging objects Study Guide
- Introduction to enlargements Study Guide
- Introduction to reflections Study Guide
- Introduction to rotations Study Guide
- Introduction to translation Study Guide
- Investigating transformations with Desmos Study Guide
- Investigating transformations with GeoGebra Study Guide
- Problem solving with transformations Study Guide
- Rotating objects Study Guide
- Transformed objects Study Guide
- Translating objects Study Guide
- Understanding the centre of rotation Study Guide
Browse all guides in the Year 7 Maths guide library.