Enlargement using a negative scale factor
I can perform a given enlargement on an object.
Enlargement using a negative scale factor
I can perform a given enlargement on an object.
Lesson details
Key learning points
- Each length in the shape is multiplied by the scale factor.
- Each vertex in the object is a given distance from the centre of enlargement.
- This distance is also multiplied by the scale factor to give the distance of the image's vertex.
- A negative scale factor produces an image that is the other side of centre of enlargement.
- To enlarge, you need the centre of enlargement and a scale factor.
Common misconception
Pupils may think that a negative scale factor creates a smaller image than the object.
Remind them that the absolute value will be less than 1 and greater than 0 to create a smaller image. Whether the scale factor is positive or negative does not affect this.
Keywords
Transformation - A transformation is a process that may change the size, orientation or position of a shape.
Enlargement - Enlargement is a transformation that causes a change of size.
Scale factor - A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.
Centre of enlargement - The centre of enlargement is the point from which a shape is enlarged.
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
Loading...