'Cross products property' presentation slideshows

Unit 3: Ratios and Proportional Relationships

Unit 3: Ratios and Proportional Relationships. MCC7.RP.1 MCC7.RP.2a MCC7.RP.2b MCC7.RP.2c MCC7.RP.2d MCC7.RP.3 MCC7.G.1. Lesson 1: Ratios. Please fill in your guided notes as you view the presentation. Have fun!!. In the real world.

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7-1

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Geometry Chapter 7

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2-6

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7-1

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Splash Screen

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Splash Screen

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Splash Screen

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Splash Screen

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8-6 The Law of S ines and Law of Cosines

8-6 The Law of S ines and Law of Cosines. You used trigonometric ratios to solve right triangles. Use the Law of Sines to solve triangles. Use the Law of Cosines to solve triangles. Law of Sines.

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Example 1

Example 1. In a survey of American families, 150 families had a total of 360 children. What is the ratio of children to families? On average, how many children are there per family?. Make sure you pay attention to the order of the wording. 360/150 2.4 children/family. What is a Ratio?.

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5-Minute Check 1

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Chapter 5 : Ratios, Rates & Proportions Section 4

Chapter 5 : Ratios, Rates & Proportions Section 4. Solving Proportions. California Standards. Number Sense 1.2: Interpret and use ratios in different contexts. Number Sense 1.3: Use proportions to solve problems. Use Cross-Multiplication as a method for solving such problems.

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7-2 Similar Polygons

7-2 Similar Polygons. You used proportions to solve problems. Use proportions to identify similar polygons. Solve problems using the properties of similar polygons. Similar Polygons. Similar polygons have the same shape but not necessarily the same size. These figures are not similar.

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Chapter 5 : Ratios, Rates & Proportions Section 4

Chapter 5 : Ratios, Rates & Proportions Section 4. Solving Proportions. Anticipatory Set. California Standards. Number Sense 1.2: Interpret and use ratios in different contexts.

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7-7 Scale Drawing and Models

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Do Now 2/16/10

Do Now 2/16/10. Take out HW from last week. Text p. 278, #10-30 evens, #35 Copy HW in your planner. Text p. 283, #12, 16, 20-34 evens, #37-41 all Quiz sections 6.1-6.3 Thursday Be ready to copy POTW #3. POTW #2 will be due tomorrow. 10) 42 12) 9 14) 99 16) 13 18) 6 20) 40 22) 13

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EXAMPLE 1

NP. NP. In the diagram,. =. =. ST. ST. Write four true proportions. MN. MN. RS. RS. , then. Because. =. x. 8. 4. 4. x. 4. 10. By the Reciprocal Property, the reciprocals are equal, so. 8. 10. x. 10. =. 8. By Property 3 , you can interchange the means, so. =.

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Substitute 17 for a and 25 for b .

a. b. SOLUTION. Write a proportion where 25 is the base and 17 is a part of the base. p. p. 100. 100. =. 17. =. 25. EXAMPLE 1. Find a percent using a proportion. What percent of 25 is 17?. Write proportion. Substitute 17 for a and 25 for b. 17 is 68% of 25.

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