Dilation/Similarity Practice

What is Dilation?

• Dilation means to enlarge or reduce
• Dilation means to reflect on something
• Dilation means to like something
• Dilation means to make something different by making it smaller

How does a dilation change the angles of a polygon?

• It changes by the scale factor.
• Dilations do not change the angles.
• It is impossible to answer this question.  The angles change unpredictably.
• The angles all change to larger angles.

What is the definition of similarity?

• same shape, same size

• same shape, different size

• different shape, same size

• different shape, different size

The __________ is the ratio of a length of the New image to the corresponding length on the Original figure.

• reduction

• enlargement

• scale factor

• center of dilation

A scale factor of less than one means

• that the new image will be larger than the original.

• That the new image will be the same as the original.

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

• That the new image will be a reduction of the original.

What is the scale factor from MNOP to ABCD? #30

• 2/3

• 1/2

• 3/2

• 2

Choose the correct scale factor:

• 2
• 3
• 1/3
• 1/2

Did the image enlarge, reduce or none of the above?

• Enlarge
• Reduce
• None of the above

The pair of figures is similar. Find the missing side.

• x = 12
• x = 3
• x = 40
• x = 4

What is the scale factor from ΔDEF to ΔABC?

• 1/2

• 7/3

• 2

• 10/3