Area of a Pentagon

​
area pentagon ABCDE = area triangle BCD + area triangle BDE + area triangle BAE = 74.5025​
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.

External Links

Heron's Formula (Wolfram MathWorld)
Polygon (Wolfram MathWorld)

Permanent Citation

Alvaro José Ibarra Rivas
​
​"Area of a Pentagon"​
​http://demonstrations.wolfram.com/AreaOfAPentagon/​
​Wolfram Demonstrations Project​
​Published: March 7, 2011