1. **Homework: Review worksheet**
Agenda 1/12
Warm up
Grade assignment 7.4
Whiteboard Review Activity
**Homework: Review worksheet**

2. Warm Up
Find x. 20
x = 6

3. Whiteboard Review Activity

4. Question 1
Determine if these two triangles are similar.
Not similar

5. Question 2
Find AC.
AC = 14

6. Question 3
Solve for x and y. x y
40
60
x = 60, y = 140

7. Question 4
If 𝐴𝐵𝐶𝐷 ~ 𝑃𝑄𝑅𝑆, find the scale factor of 𝐴𝐵𝐶𝐷 to 𝑃𝑄𝑅𝑆 and the perimeter of each polygon.
SF = 4 5
Perimeter of ABCD = 68
Perimeter of PQRS = 85

8. Question 5
Find the value of x.
x = 17.5

9. Question 6
Determine whether the triangles are similar. If so, write a similarity statement. Explain your reasoning.
Similar by AA, ∆𝐴𝐵𝐶 ~ ∆𝐷𝐸𝐹

10. Question 7
Find the value of x and y.
x = 5, y = 8

11. Question 8
In ∆𝐴𝐵𝐶 𝐵𝐶=15, 𝐵𝐸=6, 𝐷𝐶=12, & 𝐴𝐷=8. Determine whither 𝐷𝐸 || 𝐴𝐵 . Justify your answer.
Yes, they are parallel because they each have a scale factor of 2 3

12. Question 9
Find the value of x.
x = 9

13. Question 10
A cell phone tower casts a 100-foot shadow. At the same time, a 4-foot 6-inch post near the tower casts a shadow of 3 feet 4 inches. Find the height of the tower.
About ft