Dilations and Scale Factor

Front

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

Back

The dilation is a reduction.

Front

What is a dilation in geometry?

Back

The process of making a polygon larger or smaller without changing its shape.

Front

Does a dilation produce a congruent figure?

Back

No, a dilation does not produce a congruent figure.

Front

What is the image of the point B (4,9) under a dilation with center at the origin and a scale factor of 2?

Back

B' (8, 18).

Front

What does a scale factor of 1/2 do to a figure?

Back

It reduces the figure.

Front

What is the scale factor in a dilation?

Back

The ratio of the length of a side of the image to the length of the corresponding side of the original figure.

Front

If the scale factor is greater than 1, what type of dilation occurs?

Back

An enlargement.

Front

What is the center of dilation?

Back

The fixed point in a dilation from which all points are expanded or contracted.

Front

How do you calculate the coordinates of a dilated point?

Back

Multiply the original coordinates by the scale factor.

Front

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

Back

The figure remains unchanged.