53 inequalities in one triangle - pc\|mac

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Geo 53 Lesson with notes 3rd a.notebook 1 January 13, 2016 Dec 309:38 AM 53 Inequalities in One Triangle Learning Targets: I can recognize and apply properties of inequalities to the measures of the angles of a triangle I can recognize and apply properties of inequalities to the relationships between the angles and sides of a triangle Which is the largest angle of the triangles in the picture? Which is the longest side of the triangle? What is the relationship between the largest angle and the longest side? Jan 1211:31 AM

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Page 1: 53 Inequalities in One Triangle - PC\|MAC

Geo 5­3 Lesson with notes 3rd a.notebook

1

January 13, 2016

Dec 30­9:38 AM

5­3 Inequalities in One Triangle

Learning Targets:I can recognize and apply properties of inequalities to the measures 

          of the angles of a triangleI can recognize and apply properties of inequalities to the     

          relationships between the angles and sides of a triangle 

Which is the largest angle of the triangles in the picture?

Which is the longest side of the triangle?

What is the relationship between the largest angle and the longest side?

Jan 12­11:31 AM

Page 2: 53 Inequalities in One Triangle - PC\|MAC

Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Jan 12­11:49 AM

Jan 8­11:28 AM

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Jan 8­11:47 AM

Jan 8­11:55 AM

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­9:48 AM

Or on a number line, the number farther to the right is larger.

Dec 30­9:48 AM

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­9:51 AM

The definition and properties can be applied to the measures of angles

By the Exterior Angle Theorem, m<1 = m<2 + m<3

Therefore, m<1 > m<2 and m<1 > m<3

Dec 30­10:07 AM

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­10:11 AM

Example 1:

Use the Exterior Angle Inequality to list all of the angles that satisfy the stated condition.

1. measures less than m<14

2. measures greater than m<5

Dec 30­10:11 AM

Use the Exterior Angle Inequality to list all of the angles that satisfy the stated condition.

3. measures less than m<14

4. measures greater than m<5

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­10:25 AM

Recall if two sides of a triangle are congruent, then the angles opposite them are congruent.

When the triangle is scalene (all sides are different) notice the angle relationships.

The longest side is opposite the largest angle and the shortest side is opposite the smallest angle

Dec 30­10:35 AM

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­10:37 AM

Dec 30­10:25 AM

Example 2:

5. List the angles of ΔABC in order from smallest to largest.

6. List the angles and sides of ΔABC in order from smallest to largest.

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­10:41 AM

Dec 30­10:42 AM

Example 3:

7. List the sides of ΔABC in order from shortest to longest.

8. List the angles and sides of ΔABC in order from shortest to longest.

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Geo 5­3 Lesson with notes 3rd a.notebook

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January 13, 2016

Dec 30­10:49 AM