1. DO NOW 10.9.17 ? 20 ft Directions (Part 1): Directions (Part 2):
Open your Engage NY Module 3 workbooks to the line paper between pages S.25 and S.26.
On the top line, write today’s date.
A person standing 20 feet away from a street light casts a shadow as shown in the picture.
The triangles shown are SIMILAR.
How many times taller is the street light than the person?
Draw the two figures in the foreground (person + shadow and street light on the page.
Label any given information.
Interpret any information that is given, but not yet labeled in the picture.
What information is unknown? ?
20 ft
Directions (Part 2):
 The height of the street light is ______ feet.

2. Turn to Page S.21
FUNDAMENTAL THEOREM OF SIMILARITY
What information do you currently know that is stated or shown in the picture below?

3. O Stay on Page S.21 PROMPTS:
Which points / segments are the pre-image (original figure) and which are the image (new figure)?
Which direction is each vector traveling?
Where do you think the center of dilation began? HINT: not at P or Q
Is the original Segment PQ enlarged or reduced in size?

4. A’ Turn to Page S.22 PROMPTS:
What are the coordinates for Point A? A ( , )
How can you use the coordinates to help dilate a figure with a scale factor?
What does it mean when the scale factor is r = 4 ?

5. A’ A’’ Turn to Page S.23 PROMPTS:
CHANGE YOUR DIRECTIONS TO READ AS FOLLOWS:
½ (Label as A’) and ¼ (Label as A’’)
PROMPTS:
What are the coordinates for Point A? A ( , )
How can you use the coordinates to help dilate a figure with a scale factor?
What does it mean when the scale factor is r = ½ ?
What does it mean when the scale factor is r = ¼ ? A’
A’’

6. 53 3 153 1 A’ Turn to Page S.24 PROMPTS:
Wrong
Turn to Page S.24
PROMPTS:
What are the coordinates for Point A? A ( , )
How can you use the coordinates to help dilate a figure with a scale factor?
What does it mean when the scale factor is r = 5/3 ? A’ 53 3
153 1

7. A’ B’ A’ ( 4 ½ , 3 ½ ) B’ ( 2 ¼ , 1 ¼ ) Turn to Page S.25 PROMPTS:
What are the coordinates for Point A and Point B? A ( , ) B ( , )
How can you use the coordinates to help dilate a figure with a scale factor?
What does it mean when the scale factor is r = ½ ?
What does it mean when the scale factor is r = ¼ ? A’ B’
A’ ( 4 ½ , 3 ½ )
B’ ( 2 ¼ , 1 ¼ )

8. Turn to Page S.26
A (7 , 9)  A’ ( , )
x 6
x 6

9. Stay on Page S.26

10. A ( , )  A’ ( , ) B ( , )  B’ ( , ) C ( , )  C’ ( , )
Turn to Page S.27
A ( , )  A’ ( , )
B ( , )  B’ ( , )
C ( , )  C’ ( , )

11. Turn to Page S.28

12. Turn to Page S.29

13. Turn to Page S.30

14. Turn to Page S.31

15. Turn to Page S.32