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**Lesson (6.5) Parts of Similar Triangles**

Altitude Median Angle bisector A A A B B D C M C B N C

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B C A M L N D then If Y Z E X F The perimeter of the triangle is the sum of the measures of its sides

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**Angle bisector Theorem**

If AD is an angles bisector then B C D

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**Check for understanding**

Find the perimeter of the given triangle Step1: Set up proportions. Step2: substitute the values. Step3: Cross multiply and solve for x.

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**Check for understanding**

Find x Step1: Set up proportions. Step2: Cross multiply and solve for x.

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**Check for understanding**

Find x Step1: Set up proportions. Step2: Cross multiply and solve for x.

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**Check for understanding**

Find x Step1: Use the angle bisector Theorem. Step2: Cross multiply and solve for x.

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Homework Page 320 – 322 #s (10, 14, 18, 22, 24)

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**Written Exercises page 320**

10) Find the perimeter of the given triangle Step1: Set up proportions. Step2: substitute the values. Step3: Cross multiply and solve for x.

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**Written Exercises page 320**

14) Find the perimeter of the given triangle Step1: Set up proportions. Step2: substitute the values. Step3: Cross multiply and solve for x.

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**Written Exercises page 320**

18) Step1: Set up proportions. Step2: substitute the values. Step3: Cross multiply and solve for x.

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**Written Exercises page 321**

22) Find x Step1: Set up proportions. Step2: Cross multiply and solve for x.

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**Written Exercises page 321**

24) Find x Step1: Use the angle bisector Theorem. Step2: Cross multiply and solve for x.

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Over Lesson 7–3 Determine whether the triangles are similar. Justify your answer. Determine whether the triangles are similar. Justify your answer. Determine.

Over Lesson 7–3 Determine whether the triangles are similar. Justify your answer. Determine whether the triangles are similar. Justify your answer. Determine.

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