Open Middle: Same-Side Interior or Exterior Angles
- Author:
- Tim Brzezinski
- Topic:
- Angles, Geometry, Straight Lines, Triangles
Your task:
Without repeating digits, change the input boxes on the left try to make lines a and b parallel. You can move the LARGE POINTS if you wish! The picture on the right IS drawn to scale.
Explain how you know your setup causes lines a and b to be parallel. What exactly justifies this?