http://demonstrations.wolfram.com/AreaOfAPentagon/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows that you can calculate the area of a pentagon or any other polygon using triangulation in combination with Heron's formula for the individual triangle areas.
Contributed by:Alvaro Jose Ibarra Rivas (Institucion Educativa Santa Fe Santiago de Cali - Colombia)
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