Scale Factor

Front

What is a scale factor?

Back

A scale factor is the number you multiply by the sides of a figure to create a similar figure.

Front

How do you find the missing side in similar figures?

Back

You can find the missing side by setting up a proportion using the scale factor and the corresponding sides of the similar figures.

Front

What are corresponding sides?

Back

Corresponding sides are sides that are in the same position in different similar shapes.

Front

If the scale factor from a large triangle to a small triangle is 3/4, what does this mean?

Back

It means that each side of the small triangle is 3/4 the length of the corresponding side of the large triangle.

Front

How do you solve for a missing length using scale factors?

Back

Set up a proportion between the known lengths and the unknown length, then solve for the unknown.

Front

What is the relationship between the areas of two similar figures?

Back

The ratio of their areas is the square of the scale factor.

Front

If a triangle has sides of 6, 8, and 10, and is scaled down by a factor of 1/2, what are the new side lengths?

Back

The new side lengths will be 3, 4, and 5.

Front

What happens to the perimeter of a figure when it is scaled by a factor of k?

Back

The perimeter is also scaled by the same factor k.

Front

If two figures are similar, what can be said about their angles?

Back

All corresponding angles of similar figures are equal.

Front

How do you determine if two figures are similar?

Back

Two figures are similar if their corresponding angles are equal and the lengths of their corresponding sides are proportional.