Rev Dilations and Similarity

Front

What is a scale factor in dilations?

Back

The scale factor is the ratio of a length of the new figure to the corresponding length on the original figure.

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

How do you find the image of a point under dilation?

Back

Multiply the coordinates of the point by the scale factor.

Front

If the original point is B(4,9) and the scale factor is 2, what is the image B'?

Back

B' is (8, 18).

Front

What mathematical operation is used with the scale factor in a dilation?

Back

Multiplication.

Front

What is the center of dilation?

Back

The fixed point in the plane about which all points are expanded or contracted.

Front

If a figure is dilated with a scale factor of 1, what happens to the figure?

Back

The figure remains unchanged.

Front

What is the effect of a negative scale factor in dilation?

Back

It reflects the figure across the center of dilation.

Front

What is the relationship between similar figures and scale factors?

Back

Similar figures have corresponding sides that are proportional, which is represented by the scale factor.