Question

How do I know the scale factor of the dialation.?
WILL MEDAL
http://www.thelearningodyssey.com/Assess/DPT/QIEImagesStorage/AQ13G/AQ13GE_GE9110_02_stem1_1.gif
A) -1/3
B)1/3
C)-3
D)3

Answer 1

from blue to red, or red to blue?

Answer 2

Blue to red.

Answer 3

May I say, first write out the coordinates for all of the points

Answer 4

i guess the prime means from red to blue actually

Answer 5

@ardentpikachu
Unless you have instructions to the contrary, letters with ' are the image.
So A is transformed into A', so it should be erom red to blue.

Answer 6

It does typically @satellite73

Answer 7

but i could be wrong
count
the red one has two across, the blue one has 6, so multiply by 3

Answer 8

I am so confused..

Answer 9

@satellite73 agree.
And the centre of dilation is at the origin, since
mOX'/mOX=3.

Answer 10

@ardentpikachu here is a list of how you go about this:
1. Write out the coordinates.
2. Match up corresponding angles.
3. Figure out what you have to multiply one set of ordered pairs by to get the scaled set.
4. The number you multiply by is the scale factor.

Answer 11

They should usually give you the centre of dilation, O.
In that case, measure OX' and OX (or any other convenient letter, such as Y, or Z).
The ratio of mOX'/mOX is the factor of dilation.
IF OX' and OX are in diagonally opposite quadrants, the dilation factor is negative..