HERON'S FORMULA:

A Geometric Proof

See Also: Problem Solving with Heron's Formula

Review:

1. The incircle and its properties.

2. An excircle and its properties.

3. The area of the triangles is rs, where r is the inradius and s the semiperimeter.

4. The points of tangency of a circle inscribed in an angle are equidistant from the vertex.

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