[i]Heron's Formula[/i] gives the area of a triangle from the lengths of its three sides.
Compass-and-Straightedge proof. Step-by-step using the Construction Protocol.
Along the way, giving the answer to a related
[i]Proposition: Determine the radius of the circle inscribed in a triangle.[/i]
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These are my self-study materials. Let me know how I can make them more useful to you.
