If triangle A is similar to triangle B with a scale factor from A to B equal to 3, what is the scale factor?

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Multiple Choice

If triangle A is similar to triangle B with a scale factor from A to B equal to 3, what is the scale factor?

Explanation:
The scale factor is 3. In similar triangles, the scale factor tells how much larger or smaller the second triangle is compared to the first. Saying the scale factor from A to B is 3 means every length in triangle B is 3 times the corresponding length in triangle A, so B is three times as large as A. The other numbers don’t fit this relation: 1/3 would mean B is smaller than A, 1/9 would correspond to a much smaller size or to area scaling, and 0 isn’t possible for a length.

The scale factor is 3. In similar triangles, the scale factor tells how much larger or smaller the second triangle is compared to the first. Saying the scale factor from A to B is 3 means every length in triangle B is 3 times the corresponding length in triangle A, so B is three times as large as A. The other numbers don’t fit this relation: 1/3 would mean B is smaller than A, 1/9 would correspond to a much smaller size or to area scaling, and 0 isn’t possible for a length.

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