Checking understanding of basic transformations

I can describe how an object has moved or changed.

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Year 7

Checking understanding of basic transformations

I can describe how an object has moved or changed.

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Share activities with pupils

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Lesson details

Key learning points

A congruent shape has not changed size
Two shapes can be congruent even if one has been reflected or rotated
An image can be described in terms of its object
The description states how the object has been changed

Keywords

Object - The object is the starting figure before a transformation has been applied.
Image - The image is the resulting figure after a transformation has been applied.
Transformation - A transformation is a process that may change the size, orientation or position of a shape.
Congruent - If one shape can fit exactly on top of another using rotation, reflection or translation, then the shapes are congruent.
Invariant - A property of a shape is invariant if that property has not changed after the shape is transformed.

Common misconception

Students may believe two shapes are congruent based purely on the shape and not the size as well.

Consider squares - all squares have the same angles and are visually identical but if the lengths are different they're not congruent.

Students could describe verbally to each other. Using MWBs, students could make a description and the other student would need to draw the image based upon the description.

Teacher tip

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).