Definition of a Dilation
- A dilation is a type of transformation that causes an image to stretch or shrink in porportion to its original or regular size.
Examples:
Scale Factor
- the scale factor is the ratio by which the images stretch or shrink
- If the scale factor is greater than one ( >1), then the image is enlarged
-If 0 & 1 is greater than ( <0 & <1) the scale factor, then the image will shrink
- Multiple the dimensions of the original image by the scale factor to get the dimensions of the dialated image.
The following remain the same :
-Angle measures
- points on a line
- midpoint of an image
- orientation of the image
- irregular polygons if the sides follow the same scale factor
When expressing Dilations :
- when you are asked or expressed dilation you will see it written as for examples D2 or D-2
what does this mean? "the number of sides od a regular polygon circles"
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