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Warm-up 4 Find the perimeter and area of both shapes, then double and triple the dimensions. What happens? 4 4

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Agenda Missing Work Begin Chapter 7 Homework

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Given: Points A, B and C are on line l Point P is not on l PB < PC Prove: m PCB 90 P ABC 1. 2. 3. 4. l

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5-5 Triangle Inequalities If two sides of a triangle are 5 and 12 what are the possible values for the size of the third side?

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Book Work Page 772 Lesson 5-1 #1, 5, 7 Lesson 5-2 #3, 5 Page 773 Lesson 5-3 #2, 6 Lesson 5-4 #2, 4 Page 773 Lesson 5-5 #4, 6, 8 Page 774 Lesson 5-6 #2, 6

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7-1 Proportions Ratio – a comparison of two numbers using division Proportion – an equation of the form a/b = c/d that states that two ratios are equivalent Cross Product – 224(150) = 100(336) extreme means b, d can not equal zero

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Example

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Answers Ahead

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7-1 Study Guide

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7-1 Practice

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7-2 Exploring Similar Polygons

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Example Polygon RSTUV is similar to polygon ABCDE The ratio of lengths of corresponding sides of similar polygons is called the Scale Factor. The scale factor of RSTUV to ABCDE is 18:4. The scale factor of ABCDE to RSTUV is 4:18. How else could these scale factors be stated? What are the values for x and y?

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Example Triangle ABC has vertices A(0, 0), B(4, 0), and C(2, 4). If the coordinates of each vertex are multiplied by 2, will the new figure be similar to the original?

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Answers Ahead

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7-2 Study Guide

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7-2 Practice

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Homework 7-1 Multicultural Activity 7-2 Study Guide & Practice

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