1. 6.6 – Use Proportionality Theorems
Goal: You will use proportions with a triangle or parallel lines.

2. proportionally
other side
*Side not being touched by line

3. Determine if lines are parallel
Example 3: Example 4:
Determine if // Determine if // .

4. proportionally VX XZ
proportional CA BC

5. Use theorem 6.6
Example 3:
A farmer’s land is divided by a newly constructed interstate. The distances are shown in meters. Find the distance CA between the north and south border of the farmer’s land.

6. Use theorem 6.6
Example 4:
Find AB.

7. Use theorem 6.7
Example 5:
In the diagram, Use the given side lengths to find DG.

8. Use theorem 6.7
Example 6:
Find AB.