unit 1: day2:

Day 2:students will be able to use dilations.
explanation: www.youtube.com/watch?v=_nHQmYs5ESw
examples:

formula:

Quiz:

1)Under a dilation, triangle A(0,0), B(0,4), C(6,0) becomes triangle A'(0,0), B'(0,10), C'(15,0).  What is the scale factor for this dilation?

Choose one: 

2
2.5
4

2)Under a dilation of scale factor 3 with the center at the origin, what will be the coordinates of the image of point B?

Choose one:

(6,3)
(2,9)
(5,6) 
(6,9

3)The graph at the left shows an example of a transformation.  Which transformation is shown?

Choose one: 

dilation
translation
reflection in origin 

key: 1)2.5 2)6,9 3)reflection in origin