Dilations Find the Scale Factor

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

• reduction

• enlargement

• scale factor

• center of dilation

A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?

• (5,3), (6,2), (1,-2)

• (6,0), (9,-3), (-6,-15)

• (2/3,0), (1,-1/3), (-2/3,-5/3)

• (-1,-3), (0,-4), (-5,-8)

If k=1.25 (k is scale factor), then a dilation will result in a(n)______

• reduction

• enlargement

• scale factor

• center of dilation

Which of the following are Dilations?

• (x, y) → (x, 3y)

• (x, y) → (3x, 3y)

• (x, y) → (x, y - 3)

• (x, y) → (.5x, .4y)

True of False: When you shrink a figure, you multiply by a fraction. 

• true

• false

Find the measure of x:

• 6

• 24

• 33

• 36

What is the scale factor from the small shape to the big shape?

• 1/2

• 7/3

• 2

• 10/3

What is the scale factor from ΔDEF to ΔABC?

• 2

• 3/2

• 2/3

• 1/2

What is the scale factor from ΔABC to ΔDEF?

• 2

• 3/2

• 2/3

• 1/2

What is the scale factor from the small fry to the large fry?

• 1/3

• 48

• 4

• 3