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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 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. an equation stating that two ratios are equivalent. are proportions
Problem #1 First Step: Write the Problem 1.
Problem #1 Second Step: Write the Proportion for the problem 1. Think: what are the corresponding sides?
Problem #1 Third Step: Rewrite using cross-multiplication 1. 21x = 27(35)
Problem #1 Fourth Step: Multiply 1. 21x = 27(35) 21x = 945
Problem #1 Final Step: Isolate the variable 1. 21x = 945 21x = 945 21 21 x = 45 in.
Problem #2 First Step: Write the Problem 2.
Problem #2 Second Step: Write the Proportion for the problem 2. Think: what are the corresponding items?
Problem #2 Third Step: Rewrite using cross-multiplication 2. b5 = 16(95)
Problem #2 Fourth Step: Multiply 2. b5 = 16(95) b5 = 1520
Problem #2 Final Step: Isolate the variable 2. b5 = 1520 b5 = 1520 5 5 b = 304 in.
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?