Geometric proof of Heron's Formula. NOTE: Help me make this worksheet better -- leave a comment. I think this proof is tough. Do you? What's confusing? Without your feedback, I don't know how to make it better.

More information: The inscribed circle: http://www.geogebratube.org/material/show/id/30923 Quadrilateral inscribed in a circle: http://www.geogebratube.org/material/show/id/29655 ρ² = (a1)x: http://www.geogebratube.org/material/show/id/31122 ________ Used In Malfatti's Problem: 1. The constraints: http://www.geogebratube.org/material/show/id/32079 2. Solution: http://www.geogebratube.org/material/show/id/32233