7.4 Dilation

7.4 Dilations

Dilation- shrink/stretch

When you resize a shape it gets bigger or smaller but it still looks similar:

• all angles stay the same

• relative sizes are the same (sides proportional)

Dilate by a scale factor of __________

(number)

Shrink: If the number is 0 < n < 1

Stretch: If the number is n > 1

Multiple Choice

If I have a scale factor of 2 I am going to...

• Shrink

• Stretch

Multiple Choice

If I have a scale factor of 1/2 I am going to...

• Shrink

• Stretch

Dilate the following

Dilate ABCD by 3
A(2,1)  B(3,1)  C(4,2)  D(3,2)

Multiple Choice

Dilate A(2,4) and B(5, -2) by a scale factor of 3.

• A (5, 7)

  B (8, 1)

• A (6, 12)

  B (15, -6)

• A (6, 12)

  B ( -15, 6)

• A ( 2/3, 4/3)

  B (5/3, -2/3)

Dilate the following

Dilate ABCD by 1/2

Draw

Dilate ABCD using a scale factor of 1/3

about the origin
A (-9,6)

B (6, 6) 

C (6, -3) 

D (−9, -3) 

Draw

Dilate ABCD using a scale factor of 2

about the origin
A(−1,−2) 

B(3,−2) 

C(3,0) 

D(−1,0) 

Poll

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