Starter quiz
- Which of these sentences use the word "sense" correctly?
- The sense of a word stays the same after a rotation because I can still read it ✓
- The sense of a word changes when I enlarge it because the letters get bigger
- The sense of a word stays the same after reflection as I can read it in a mirror
- The sense of a word changes if the letters are rewritten backwards ✓
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In which of these images has the sense changed compared to the object?- image 1 ✓
- image 2
- image 3 ✓
- image 4
- image 5
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- Write down a transformation that changes the "sense" of an object.
- 'reflection' ✓
- When an object is reflected, the size of its angles are invariant. This means the angles remain ______.
- 'the same' ✓
- Complete this sentence: "When an object is reflected, the orientation of the object _______ ."
- is invariant
- sometimes changes
- always changes ✓
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- Which of these diagrams shows a reflection?
Exit quiz
- What is the purpose of a "line of reflection"?
- It cuts the object in half to become an image.
- It is in the middle of a shape.
- It defines the position of the reflected image. ✓
- It defines the size of the reflected image.
- It defines the rotation of the reflected image.
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- What does the word "equidistant" mean?
- Two or more things that are an equal distance away from a reference point. ✓
- When two points on an object are a distance away from the image.
- When two corresponding points are parallel to the -axis or -axis.
- When two corresponding points are an equal distance from the line of reflection. ✓
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- Which pieces of information are needed to fully describe a reflection?
- state that it's a reflection ✓
- show the orientation of each of its vertices
- describe how its sense will change
- state if it's a horizontal, vertical, or diagonal reflection ✓
- describe the location of the line of reflection ✓
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Which of these coordinates are suitable for defining the location of the line of reflection for this reflection?- (0, 9)
- (9, 3) ✓
- (6, 3)
- (9, 10) ✓
- (12, 6)
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Complete this sentence for the following description of a reflection: "A __________ reflection with line of reflection passing through the coordinates (8, 6) and (13, 6)"- horizontal
- vertical ✓
- diagonal
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The object is reflected in the line of reflection shown. Which point would be the correct location of the reflection of vertex A?- b
- c
- d
- e ✓
- f
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Worksheet
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Presentation
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Lesson Details
Key learning points
- 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.
Common misconception
Line segments connecting corresponding points on an image and object can intersect each other.
Corresponding point line segments after a reflection never intersect. If they do, then corresponding points have not been paired correctly.
Keywords
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.
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