Area of a Triangle (V3)

Shout out and thank you to [url=https://twitter.com/Sneffleupagus]Shelby Strong[/url], whose inspiration led to the creation of this resource.
Move the vertices of the triangle (A, B, C) anywhere you'd like. Then slowly slide the slider at the bottom.
What do you notice? What do you wonder? Describe.
Quick silent demo:
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– Tim Brzezinski

Information: Area of a Triangle (V3)