1. Lesson (6.5) Parts of Similar Triangles
Altitude
Median
Angle bisector A A A B B D C M C B N C

2. 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

3. Angle bisector Theorem
If AD is an
angles bisector
then B C D

4. 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.

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

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

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

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

9. 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.

10. 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.

11. Written Exercises page 320
18)
Step1: Set up proportions.
Step2: substitute the values.
Step3: Cross multiply and solve for x.

12. Written Exercises page 321
22)
Find x
Step1: Set up proportions.
Step2: Cross multiply and solve for x.

13. Written Exercises page 321
24)
Find x
Step1: Use the angle bisector Theorem.
Step2: Cross multiply and solve for x.