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Dilation of a Line

Dilation all Points on a line

1. In the applet below, line segment AB has a center point of dilation called Point D.

Keep point D on the line segment and dilate the line segment by moving the slider to adjust the scale factor. What happens to line segment AB when you dilate it?

Now move point D anywhere off the line segment and then dilate the line segment by moving the slider to adjust the scale factor. Now what happens to line segment AB when you dilate it?