Dilations of Triangles

Triangle PQR is similar to triangle DEF shown. Which describes the relationship between the corresponding sides of the two triangles?

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What does the scale factor do in a dilation?

• Tells you how much the image grows or shrinks

• Tells you what the center of dilation is

• There's not enough information here to answer this

• Nothing, it's unnecessary information

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

• Enlarge

• Reduce

• None of the above

Under a dilation, which scale factor will result in a congruent image?

• -2

• 0

• 1

• ¹/₂

Dilate the figure by a scale factor of 3 with the origin as the center of dilation. What are the coordinates of the image?

• A'(9,9) B'(18,18) C'(27,9)

• A'(6,6) B'(9,9) C'(12,6)

• A'(0,0) B'(3,3) C'(6,0)

• A'(1,1) B'(2,2) C'(3,1)

Dilation changes a shape's __________?

• Size

• Position

• Form

• Orientation

Dilate Point B by a scale factor of 3:

• (12,0)

• (12,12)

• (4,3)

• (0,12)

Click image to enlarge

• A

• B

• C

• D

If your SF=6/5, what type of dilation is it?

• enlargement

• reduction