Parallelogram: Theorem (3)
- Tim Brzezinski
What special type of quadrilateral was formed in the first half of your sliding-the-slider? How do you know this?
What else can you conclude about this special type of parallelogram? Be specific!
Write a coordinate geometry proof that formally proves what you've seen illustrated here. (Make sure you have appropriate variable coordinates for your initial setup!) For this theorem, a coordinate-geometry method of proof is actually A LOT EASIER than a 2-column or paragraph proof!