1. TEST REVIEW Stretching & Shrinking

2. 1. The ratio of two adjacent side lengths of a rectangle is Which of these could be the ratio of two adjacent side lengths of a similar rectangle? 2323 2 3 A. 4/9 B. 4/3 C. 2/6 D. 4/5 E. 6/9 F. 8/15 G. 100/200

3. What is the height of the actual pyramid? Length of Base 5cm 40cm Height of Side 4cm x ModelActual Pyramid A. x = 40cm B. x = 32m C. x = 32cm D. x = deodorant E. None of the above

4. The scale factor for this proportion is: Length of Base 5cm 40cm Height of Side 4cm x ModelActual Pyramid A. 5 B. 8 C. 40 D..25

5. If the scale factor between two corresponding sides is 8, what is the perimeter factor? A. 8 B. 64 C. 8.5 D. deodorant E. 4

6. If the scale factor between two corresponding sides is 8, what is the area factor? A. 8 B. 64 C. 8.5 D. deodorant E. 4

7. What would happen to a figure if you transformed it using this rule: (3x, 6y) A. Your shape will be similar. B. Not similar. The new figure will be too short and “stout.” C. Not similar. The new figure will be too tall and skinny D. Not similar. The new figure will be upside down. E. Similar, but the new figure moves location (translates)

8. Cassie is making a scale model of the wind turbine. The measurements of the real windmill are shown. Height: 984 feet Base structure: 330 feet long Cassie’s model will be 12 inches tall. ABOUT how long should each side of the model’s square base be? A. 7 in B. 6 in C. 5 in D. 4 in E. Cassie is awesome.

9. The two rectangles below are similar. Find the missing measurement. 10 6 25 b These rectangles are not drawn to scale. A. b = 15 B. b = 18 C. b = 12 D. b = 10 Answer Now

10. The foundation of Briana’s new house has dimensions of 11m x 66m. Another foundation was built from it using a scale factor of 1.5. The area of the new foundation is how many times the area of Briana’s house? A. 1.5 B. 30 C. 66 D. 2.25 E. None of the above

11. Briana’s new house has dimensions of 11m and 66m. Another foundation was build from it using a scale factor of 1.5. The perimeter of the new foundation is how many times the perimeter of Briana’s house? A. 1.5 B. 30 C. 66 D. 2.25 E. None of the above

12. The distance between Newburyport and Seabrook is 15 miles. If we are using a scale of 1 inch to 10 miles to draw a map, how many inches on the map should be between Newburyport and Seabrook? 1. 15 inches 2. 10 inches 3. 2 inches 4. 1.5 inches 5. None of the above

13. Emily wanted to find the height of the flagpole. She used the sun’s shadow, put a stick in the ground, and recorded some measurements. What is the height of the flagpole? 600 cm 200 cm 150 cm A. 600cm B. 300cm C. 300m D. 450m E. 450cm

14. Here is a triangle and its image. Which of these rules was used to make the image? A. (2x, 2y) B. (x, 2y) C. (2x, y) D. (2x, 4y) E. (4x, 2y)

15. Here is a triangle and its image. Which of these rules was used to make the image? A. (2x, 3y) B. (3x, 2y) C. (x +2, y+3) D. (2x, 4y)

16. How does this rule affect an image? (x + 3, y - 2) SHORT ANSWER

17. If a team of engineers is using similar triangles to estimate the width of the river, a) How would they do so? B) How long should they build their bridge? Future Bridge 18 m 12 m 8 m OPEN RESPONSE

18. 8.) A rectangle has dimensions of 1 and 6. Another rectangle was drawn from it using a scale factor of 1.5 The area of the large rectangle is how many times the area of the small rectangle? A. 6 B. 3 C. 1.5 D. 2.25

19. 11.) What is the ratio of the two sides of Shape A, from long side to short side? x 30 25 20 A B These two parallelograms are similar. A..5 B. 1.25 C. x/25 D. 30/20 = 3/2

20. 11.) Find the value of x. x 30 25 20 A B These two parallelograms are similar. A. 25 B. 30 C. 37.5 D. 18.5

21. 11.) What is the scale factor from shape B to Shape A? x 30 25 20 A B These two parallelograms are similar. A. 2/3 B. 1/3 C. 2 D. 1.5

22. 11.) What is the scale factor from shape A to Shape B? x 30 25 20 A B These two parallelograms are similar. A. 2/3 B. 1/3 C. 2 D. 1.5

23. 13.) Colin is using a mirror to estimate the height of the traffic light. He is standing 2 m away from the mirror. It is 150 cm tall from the ground to his eyes. The traffic light is 6m away from the mirror. Knowing that these triangles are similar, how tall does Colin estimate the light to be? A. 400 B. 450 C. 500 D. 550

24. Good Luck!