Scale factor

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. It is used to enlarge or reduce figures in geometry.

Front

What does a scale factor greater than 1 indicate?

Back

A scale factor greater than 1 indicates enlargement of a figure.

Front

What does a scale factor less than 1 indicate?

Back

A scale factor less than 1 indicates reduction of a figure.

Front

What is the scale factor of 4.2?

Back

Enlargement.

Front

What is the scale factor of 0.1?

Back

Reduction.

Front

What is the scale factor of 4/5?

Back

Reduction.

Front

What is the scale factor of 0.75?

Back

Reduction.

Front

What is the scale factor of 8/8?

Back

Preserve (no change in size).

Front

If a triangle has a scale factor of 2, what happens to its area?

Back

The area increases by a factor of 2^2 = 4.

Front

If a rectangle is reduced by a scale factor of 0.5, what happens to its perimeter?

Back

The perimeter is also reduced by a factor of 0.5.