Dilation & Rotation Rules

Increase or Decrease in a figure on the coordinate plane.

Determined by the scale factor given.

Point P ( 1, 3) is dilated by a scale factor of 3

What is Point P'?

P' ( 3, 9)

Rule: ( 3x, 3y)

Did the figure increase or decrease?

Point H ( 2, 6)

Dilated by a scale factor of 1/2.

What are the coordinates of H'?

Point H' ( 1, 3)

Rule:  $\left(\frac{1}{2}x,\ \frac{1}{2}y\right)$  

Scale Factor can be found by...

 $\frac{image}{pre-image}$  

Find the scale factor in the given dilation.

Point M ( 1, 4) and Point M' ( 2, 8)

 $\frac{image}{pre-image}=\frac{2}{1}=2$  

the scale factor is 2: ( 2x, 2y)