Question

What is the scale factor of the dilation that maps the solid image onto the dotted image in the figure below?
http://cdn.activelms.com/data/042c73b1-ddf5-4fd6-91e7-6c8434228f3d/Geometry%20Images/unit%209-4%20q3.png

Answer 1

a) 1/5
b)5
c) 1/3
d)3

Answer 2

any idea? what number are we "changing" , the 5 or the 15 ?

Answer 3

15

Answer 4

maps the solid image onto the dotted
we want to "change" the solid to the dotted
which number goes with the solid ?

Answer 5

5

Answer 6

yes. the idea is we "change" 5 i.e. multiply it by a scale factor to get 15
5k=15
what is k ?
any idea ?

Answer 7

k=3

Answer 8

yes, the scale factor (that changes 5 to 15) is 3

Answer 9

okay thanks