Year 7 - Maths
Describing a reflection
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 understand the minimum information required to describe a reflection.
Key Notes
- The image is a reflection of the object.
- A line of reflection can be thought of as a mirror line.
- The line of reflection can be vertical, horizontal or diagonal.
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.
- Equidistant: Points A and B are equidistant from a third point C if the distance AC is equal to the distance BC.
Common Mistakes To Avoid
- Line segments connecting corresponding points on an image and object can intersect each other.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The image is a reflection of the object. A line of reflection can be thought of as a mirror line.
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: Line segments connecting corresponding points on an image and object can intersect each other. Correction: Corresponding point line segments after a reflection never intersect. If they do, then corresponding points have not been paired correctly.
More Lessons In This Unit
- Checking understanding of basic transformations 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
- Reflecting objects Study Guide
- Rotating objects Study Guide
- Transformed objects Study Guide
- Translating objects Study Guide
- Understanding the centre of rotation Study Guide
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