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February 4, 2011

February 4, 2011. 1) Write your homework in your agenda: NONE 2) Grab a Computation Challenge, keep it face down and put your name on the back. 3) Take out your homework: text p. 306 and leave it on your desk. Answers to Textbook p. 306. 1) a = 22.5 cm 2) y = 56m 3) 28 ft 4) About 25 ft.

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February 4, 2011

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  1. February 4, 2011 1) Write your homework in your agenda: NONE 2) Grab a Computation Challenge, keep it face down and put your name on the back. 3) Take out your homework: text p. 306 and leave it on your desk.

  2. Answers to Textbook p. 306 1) a = 22.5 cm 2) y = 56m 3) 28 ft 4) About 25 ft

  3. February 4, 2011 1) Write your homework in your agenda: NONE 2) Grab a Computation Challenge, keep it face down and put your name on the back. 3) Take out your homework: Kuta software worksheet and leave it on your des

  4. Answers to Kuta software wksh 2) X = 40 4) X = 3 6) X = 10 8) X = 42 10) X = 9 12) X = 8 14) X = 30 16) X = 12

  5. Scale Factor and Similar Figure Practice

  6. Identify the scale factor Scale Factor = 1//24

  7. Find the missing side x = 2 7 in. 3.5 in. 4 in. x

  8. Word Problem On a scale drawing, a helicopter is 2.2 feet long. The scale factor is 1/9. Find the length of the helicopter. length = 19.8

  9. Find the scale factor Scale Factor = 3 5 15

  10. Dilate the following points Dilate triangle ABC where A (-2, 5), B(1, 8), C (7, 5) by a scale factor of 3 ½, what are the new coordinates? A’(-7, 17.5), B’(3.5, 28), C’(24.5, 17.5)

  11. Word Problem Andrew wants to dilate a photo of himself to a scale factor of 10. The original photo is 4 inches by 6 inches. What are the dimensions of the new photo? 40 in by 60 in

  12. Word Problem A triangle has an area of 3 cm2 and a similar triangle has an area of 75cm2. What is the scale factor? Scale Factor = 5

  13. Find the new coordinates Dilate (-4, -7) with a scale factor ¾. (-3, -21/4) or (-3, -5.25)

  14. Find the missing side 17.5 m x 3 m 2 m x = 35/3 or 11.7

  15. Find the new coordinates The coordinates (2 ½, -8 ¼) is dilated by a scale factor of 3/8. (15/16, 11/4)

  16. Find the scale factor, length ratio and area ratio 14 km x 12 km 6 km Scale Factor = ½, length ratio = ½, area ratio = ¼

  17. Find the new coordinates The coordinates (-2.75, -3.6) were dilated by a scale factor of 2.8. ( -7.7, 10.08)

  18. Dilate the triangle Triangle ABC with a scale factor of .25 A (2, 2) B (8, 4) C (4, 12) A’(½, ½), B’(2,1), C’(1,3)

  19. Word Problem A rectangle has an area of 1 in2 and a similar rectangle has an area of 81 in2. What is the scale factor? Scale Factor = 9

  20. Find the area ratio 5 cm x 2 cm 4 cm Area ratio = 6¼ or 6.25

  21. Identify the scale factor Scale Factor = 1/22

  22. Find the scale factor Scale Factor = ½ A (4, 10) A (2, 5) A (1, 2) B (4, 2) B (8, 4) C (2, 4)

  23. Find the scale factor Scale Factor = 9/2 8 36

  24. Find the scale factor Scale Factor = ¼ 6 24

  25. Word Problem Emily decides to dilate the area of her garden to a scale factor of 3. The original length of 9 feet and the original width is 4 feet. What is the new length and width? New length = 27 ft, New width = 12 ft

  26. Find the new coordinates (-8 ½, 4 ½) is dilated by a scale factor of 5. (-85/2, 45/2)

  27. Find the scale factor, length ratio and area ratio 12 in. 6 in. 3 in. x in. Scale Factor = 2, length ratio = 2, area ratio = 4

  28. Word Problem Sam created a baseball diamond. Each side was 16 feet. He wanted to dilate it by a scale factor of 2. What would the area be? Area = 4 feet

  29. Find the scale factor, length ratio and area ratio 4 m 1 m 2 m 8 m Scale Factor = 4, length ratio = 4, area ratio = 16

  30. Find the missing side 6 m 3 m x 10 m

  31. Word Problem Caryn wants to change a 5 x 7 photograph to fit in a poster frame. She wants the new width to go from 5 to 23.75. What will the new length be?

  32. Find the missing side 1 m 3 m x 2 m

  33. Find the new coordinates Dilate (3, 6) with a scale factor 2 ½.

  34. Find the new coordinates Dilate (8, 16) 120%

  35. Word Problem Michael has a rectangular sandbox with a width of 4.7 feet and length of 3.28 feet. He wants his new sandbox to have a width of 9.4 feet. What would the new length be?

  36. Find the new coordinates Dilate (8, 16) 20%

  37. Find the missing side 12 cm x 3 cm 60 cm

  38. Word Problem Julie created a garden in the shape of a rectangle. The length of the garden was 3 feet and had an area of 48 ft2. The length of the new garden is 15 feet. What is the area of the new garden?

  39. Find the missing side 20 ft 4 ft 2 ft x

  40. Find the scale factor, length ratio and area ratio x .5 m 2.5 m 3.75 m

  41. Find the area ratio 4.2 miles 3 miles 2 miles 2.8 miles Area ratio = 2¼ or 2.25

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