Heron's Formula, Geometric Proof
Geometric proof of Heron's Formula.
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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
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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