Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Geometry February 13, 2017 7.1 Ratios and Proportions DO NOW Solve for x: 1. 5π₯ = 40 2. 3. π₯ 7 1 2 =4 = π₯ 8 Chapter Objective I can explore scale factors and similar polygons. Todayβs Objectives 1. Discuss/review ratios and proportions Ratio A comparison of two values representing relative size of two values: π πβΆπ π to π π Ratio Ex. Jalel is planting a garden. Jalel wants two roses for every three carnations. If he buys 20 rose plants, how many carnations should he buy? Ratio Ex. If Jalel wants a total of 60 plants, how many of each should he buy? Extended ratio An extended ratio compares three or more values. Ex. If a triangleβs sides are in the ratio 3 : 4 : 5, it is a right triangle. If such a triangle has a short leg of 15, what is the length of its hypotenuse? Proportion An equation involving two or more equal ratios (equivalent fractions). 3 6 12 = = 4 8 16 Cross Products You can solve proportions for missing values by crossmultiplying. π₯ 6 = 4 8 β 8π₯ = 6 β 4 = 24 24 βπ₯= =3 8 Practice (Worksheet)