Dilations with Measurement

A dilation is which of the following: 

• only an enlargement

• only a reduction

• Either an enlargement or a reduction

• Neither an enlargement or a reduction

A dilation produces a similar figure

• True

• False

Choose the correct scale factor:

• 2

• 3

• 1/3

• 1/2

What is the scale factor from triangle ABC to triangle DEF?

• 1/2

• 7/3

• 2/1

• 10/3

A scale factor of less than one means

• that the image will be larger than the pre-image.

• That the image will be the same as the pre-image.

• That you need to subtract that amount off  of each side.

• That the image will be a reduction of the pre-image.

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

• reduction

• enlargement

• scale factor

• center of dilation

You can map PQRS to TUVW by first doing a reflection and then a dilation. What is the dilation?

• (x,y) -> (3x, 3y)

• (x,y) -> (1/3x,1/3y)

• (x,y) -> (2x, 2y)

• (x,y) -> (1/2x, 1/2y)

If a shape is dilated by a scale factor of one-half, what is the resulting perimeter? 

• The same as the perimeter of the preimage

• The new perimeter is bigger than the preimage

• The new perimeter is smaller than the preimage

• The new perimeter is 4 times the original

Triangle ABC is dilated using a scale factor of 1/2. What are the new coordinates of point A'?

• (-3, 3)

• (-12, 12)

• (-2, 2)

Figure ABCD has an area of 4 units². It is then dilated using a scale factor of 4. What is the perimeter of the new figure?

• 32

• 64

• 8