Starter quiz
- The object is what we call a shape after it has been transformed.
- True
- False ✓
- Which property is not invariant when a shape is translated?
- side lengths
- angles
- position ✓
- orientation
-
- Which properties are not invariant when a shape is rotated?
- side lengths
- angles
- position ✓
- orientation ✓
-
- Which properties are not invariant when a shape is reflected?
- side lengths
- angles
- position ✓
- orientation ✓
-
- Match each number on the left with its multiple on the right. There is only one possible solution.
- 2⇔6 ✓
- 3⇔9 ✓
- 4⇔16 ✓
- 5⇔30 ✓
Which of these is the correct location of the reflected image of vertex A?- a
- b
- c
- d ✓
-
Exit quiz
- __________ is a transformation that causes a change of size.
- 'Enlargement' ✓
- Two shapes are ______ if the only difference between them is their size.
- 'similar' ✓
- Enlarging a shape means the shape will always get bigger.
- True
- False ✓
- Which property is invariant when a shape is enlarged?
- side lengths
- angles ✓
- position
-
- Sofia is going to halve the size of a rectangle. What will happen to the angles?
- They will all double in size.
- They will all stay the same size. ✓
- They will all halve in size.
-
- Aisha's rectangle has a length of 6 cm and a width of 1.3 cm. A similar rectangle has a length of 18 cm. What will its width be?
- 1.3 cm
- 2.6 cm
- 3.9 cm ✓
- 5.2 cm
-
Worksheet
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Presentation
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Lesson Details
Key learning points
- An enlargement means a change in size.
- The lengths of the lines may change when enlarged.
- The angles inside an object do not change when enlarged.
- When an object is enlarged, the image is similar.
Common misconception
Enlargement only refers to an increase in size.
The transformation 'enlargement' refers to a change of size that can be either a stretch or a shrink.
Keywords
Enlargement - Enlargement is a transformation that causes a change of size.
Similar - Two shapes are similar if the only difference between them is their size. Their side lengths are in the same proportions.
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