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11.6 Similar Triangles & Proportions 33 22 11 Definitions Formulas & Examples Practice Problems

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Key Concepts The sum of the interior angles of any triangle is 180˚ a proportion is an equation stating two ratios are equivalent (i.e. 2/3 = 4/6) to solve a proportion for a variable, we multiply the cross products 2

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Key Concepts 3 is the symbol for a triangle is the symbol for similar is the symbol for an angle the side of a triangle is named by using the two angle names it touches with a line segment symbol above

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Key Concepts 4 Congruent (identical) angles will have the same identifying marks is congruent to

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Similar Triangles 5 Similar triangles are proportional:

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Similar Triangles 6 Similar triangles have the same corresponding angle measures: 25˚ 70˚ 85˚

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Example 7 Determine if the two triangles are similar 78˚ 51˚

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Example 8 Find the missing measures 98˚ 51˚ 98˚ 47˚ 4 3 6 a b 16

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Practice Problems Page 619 Problems 11-24 Even due today Odd due next class 9

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