Click on the link below to access eTool.
1. Triangle Sum Theorem:
- Click the points and drag to change the angles.
NOTE: The Sum and values of round (A) to (C) change when the points are moved.
![](https://media.screensteps.com/image_assets/assets/001/813/978/original/91cca2fa-20f6-40a5-9d85-c654e874005c.png)
2. How does "Show Parallel Lines" help when determining the sum of the interior angles of a triangle?
- Click the folder icon in Line for to show the Parallel Lines.
![](https://media.screensteps.com/image_assets/assets/001/813/976/original/c1966931-6cd4-4a80-82f8-738d65c13123.png)