Scale factor with Perimeter and Area

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.

Front

If the scale factor is greater than one, what happens to the figure?

Back

The figure will be an enlargement (stretch).

Front

What happens to the perimeter of a figure when multiplied by a scale factor of 1/4?

Back

The perimeter will be 1/4 the original perimeter.

Front

What happens to the area of a square when the scale factor is 2?

Back

The area will be 4 times larger.

Front

How does the area change when a figure is multiplied by a scale factor of 1/4?

Back

The area will be 1/16 the original area.

Front

When multiplying by a scale factor, how does the area change?

Back

The area will multiply by the scale factor squared (to the power of 2).

Front

What is the effect of a scale factor of 1 on a figure?

Back

The figure will remain the same size; it will not change.

Front

If a figure is enlarged by a scale factor of 3, what is the new perimeter if the original perimeter is 10 units?

Back

The new perimeter will be 30 units.

Front

If a rectangle has a length of 4 units and a width of 2 units, what is the area?

Back

The area is 8 square units (4 x 2).

Front

If the scale factor is 1/2, what happens to the area of a figure?

Back

The area will be 1/4 of the original area.