Finding Scale Factor

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, a quantity. It is used to determine how much larger or smaller a figure is compared to another figure.

Front

If the scale factor is equal to 1, the copy is ________ the original.

Back

the same as

Front

What does a scale factor greater than 1 indicate?

Back

It indicates that the new figure is larger than the original figure.

Front

What does a scale factor less than 1 indicate?

Back

It indicates that the new figure is smaller than the original figure.

Front

How do you find the scale factor between two similar triangles?

Back

Divide the length of a side of the new triangle by the length of the corresponding side of the original triangle.

Front

If triangle ABC has sides of lengths 4, 6, and 8, and triangle DEF has sides of lengths 2, 3, and 4, what is the scale factor from ABC to DEF?

Back

1/2

Front

If triangle GHI is similar to triangle JKL and the scale factor is 3, what is the length of a side in triangle JKL if the corresponding side in triangle GHI is 5?

Back

15 (3 times 5)