Describing a Stretch requires 2 things;
a) the invariant line, and
b) the stretch factor.

A'B'C' is the stretch image of ABC with the given stretch factor.
Drag point k to see how the stretch factor affects the image.
Drag points A, B and C to resize the object and repeat.

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1. What does a stretch factor of 2 mean?
2. What happens to the image when any part of the object touches the invariant line?
3. Find the relationship between A, A' and the stretch factor?
4. Which other ratios will also give the stretch factor?
5. How are the areas of ABC and A'B'C' related to the stretch factor?