Dilations Flashcards
1
Q
Dilation
A
a transformation where a figure is “reduced” or “enlarged” by a given scale factor with respect to a given point
2
Q
What type of transformations are dilations?
A
similarity transformation
3
Q
What is the “given point” for dilations?
A
center of dilation
4
Q
How do you find the scale factor?
A
image length divided by preimage length
5
Q
What is the rule for dilations?
A
If the center of dilation is the origin, (x, y) -> (nx, ny) (n is the scale factor)
6
Q
What do you have to do to fractions?
A
simplify
7
Q
What do negative factors do?
A
change location
8
Q
Isometry
A
rigid transformation
9
Q
How do you write vector notation for a dilation?
A
capital ‘D’ and center of dilation THEN scale factor in subscript
