Checking understanding of congruence
I can translate, reflect and rotate a shape.
Checking understanding of congruence
I can translate, reflect and rotate a shape.
Lesson details
Key learning points
- Translation, reflection and rotation produce an image congruent to the object.
- Translation involves moving the shape.
- Rotation involves turning the shape about a defined point.
- Reflection involves flipping the shape.
Common misconception
Pupils may find it difficult to match up corresponding measurements on two congruent shapes when they are in different orientations.
Look lengths which are between any pairs of known angles or look for angles which are between pairs of adjacent known lengths. Also, tracing paper could be used to reflect/rotate/translate one shape onto the other.
Keywords
Congruent - If one shape can fit exactly on top of another using rotation, reflection or translation, then the shapes are congruent.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
enlargement -
changing the size of an object while maintaining the same proportions
reflection -
flipping an object over a fixed line
rotation -
turning an object by a fixed amount and around a fixed point
translation -
moving every point of an object by the same distance and direction
$$a \text{ cm}$$ -
4 cm
$$b\text{ cm}$$ -
3 cm
$$c\text{ cm}$$ -
5 cm
Exit quiz
6 Questions
$$a \text{ cm}$$ -
26 cm
$$b \text{ cm}$$ -
30 cm
$$c\text{ cm}$$ -
10 cm
$$d\text{ cm}$$ -
34 cm
