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Chapter 18 Lesson 3

Chapter 18 Lesson 3. Using Proportions with Similar Polygons Pages 493-494 1-2 all. Cornell Notes – Chap. 18 Lesson 3. Details:. Main Ideas/Cues: Similar polygons Proportions. ~ shows that polygons are similar. Similar polygons have the same shape, but not necessarily the same size.

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Chapter 18 Lesson 3

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  1. Chapter 18 Lesson 3 Using Proportions with Similar Polygons Pages 493-494 1-2 all

  2. Cornell Notes – Chap. 18 Lesson 3 Details: Main Ideas/Cues: Similar polygons Proportions ~ shows that polygons are similar. Similar polygons have the same shape, but not necessarily the same size. an equation stating that two ratios are equivalent. are proportions

  3. Cornell Notes – Chap. 18 Lesson 3

  4. Cornell Notes – Chap. 18 Lesson 3

  5. Problem #1 First Step: Write the Problem 1.

  6. Problem #1 Second Step: Write the Proportion for the problem 1. Think: what are the corresponding sides?

  7. Problem #1 Third Step: Rewrite using cross-multiplication 1. 21x = 27(35)

  8. Problem #1 Fourth Step: Multiply 1. 21x = 27(35) 21x = 945

  9. Problem #1 Final Step: Isolate the variable 1. 21x = 945 21x = 945 21 21 x = 45 in.

  10. Cornell Notes – Chap. 18 Lesson 3

  11. Cornell Notes – Chap. 18 Lesson 3

  12. Problem #2 First Step: Write the Problem 2.

  13. Problem #2 Second Step: Write the Proportion for the problem 2. Think: what are the corresponding items?

  14. Problem #2 Third Step: Rewrite using cross-multiplication 2. b5 = 16(95)

  15. Problem #2 Fourth Step: Multiply 2. b5 = 16(95) b5 = 1520

  16. Problem #2 Final Step: Isolate the variable 2. b5 = 1520 b5 = 1520 5 5 b = 304 in.

  17. Cornell Notes Summary Include the following question and answer in your Cornell Notes Summary. How can you use a proportion to find the value of a variable?

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