Heron's formula: the excircles proof.

Описание к видео Heron's formula: the excircles proof.

A proof of Heron's formula relying far more on geometric ideas rather than mountains of algebra. We use properties of incircle, excircles and tangents together with similar triangles. The derivation of Heron's formula this way is enlightening and elegant!

Background material on incircles and excircles and Heron's formula...

   • Incircle and excircles, part 1.  
   • Incircle and excircles, part 2.  
   • Heron's formula: the classic proof.  

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