Unit 4 Scale Factors, Copies, & Corresponding Parts

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. In geometry, it is the ratio of the lengths of two corresponding sides of two similar figures.

Front

What happens to a figure when the scale factor is greater than one?

Back

The figure undergoes an enlargement.

Front

What happens to a figure when the scale factor is less than one?

Back

The figure undergoes a reduction.

Front

What is a scaled copy?

Back

A scaled copy is a figure that is similar to another figure, where the corresponding sides are in proportion and the corresponding angles are equal.

Front

How can 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.

Front

What are corresponding parts in similar figures?

Back

Corresponding parts are the sides and angles of similar figures that match up with each other.

Front

If triangle ABC is similar to triangle DEF, what can be said about their corresponding angles?

Back

The corresponding angles of triangle ABC and triangle DEF are equal.

Front

If the scale factor from triangle ABC to triangle DEF is 2, what does this imply about the sides of triangle DEF compared to triangle ABC?

Back

The sides of triangle DEF are twice the length of the corresponding sides of triangle ABC.

Front

What is the relationship between the areas of two similar figures when the scale factor is known?

Back

The ratio of the areas of two similar figures is equal to the square of the scale factor.

Front

What is the corresponding angle to angle ACB in triangle ABC if triangle DEF is a scaled copy?

Back

The corresponding angle in triangle DEF is the angle that matches angle ACB in triangle ABC.