Sections 4.5 and 4.6

Front

What is a transformation in which a figure is enlarged or reduced called?

Back

Dilation

Front

How would you describe similar figures?

Back

Same shape but not necessarily the same size.

Front

What is the ratio of the lengths of the corresponding sides of the image and the preimage called?

Back

Scale factor

Front

If a point (x, y) is dilated by a scale factor of k, what are the new coordinates?

Back

(kx, ky)

Front

What is the scale factor if a figure is reduced from a size of 10 to a size of 4?

Back

0.4

Front

What is the scale factor if a figure is enlarged from a size of 5 to a size of 15?

Back

3

Front

What does a scale factor greater than 1 indicate about a dilation?

Back

The figure is enlarged.

Front

What does a scale factor less than 1 indicate about a dilation?

Back

The figure is reduced.

Front

If a triangle has vertices at (1, 2), (3, 4), and (5, 6), what are the coordinates after a dilation with a scale factor of 2?

Back

(2, 4), (6, 8), (10, 12)

Front

What is the effect of a dilation on the angles of a figure?

Back

The angles remain the same.