A scale factor is the ratio of sizes of two similar figures. For example, the scale factor is 2 for the following two similar figures.
The scale factor is 2 because the triangle on the right is two times bigger than the triangle on the left.
3.Simplify, if possible.
For the two similar figures above, the original figure is the triangle on the left.
A ratio of corresponding sides is equal to 16/8 or 2.
If on the other hand, we make the triangle on the right our original figure, the scale factor is 8/16 or 1/2.