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July 2nd, 2014, 06:49 AM  #1 
Newbie Joined: Jul 2014 From: India Posts: 1 Thanks: 0  Area of a quadrilateral
Hey friends! New to this forum!! Can I find the area of a quadrilateral if just the lengths of all sides are known? I don't know the internal angles. Please help Thanks in advance! 
July 2nd, 2014, 10:25 AM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,791 Thanks: 970  
July 2nd, 2014, 11:37 AM  #3  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Welcome! Quote:
If you know the lengths of the diagonals in addition to the lengths of the sizes then you can find the area, though. Also (as mentioned above) you can do it if you know the quadrilateral can be inscribed in a circle using Brahmagupta's formula (the extension of Heron's formula to quadrilaterals).  
July 2nd, 2014, 11:38 AM  #4  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Hello, shankarathreya Quote:
Think about it . . . Suppose we have a quadrilateral with four equal sides. What is its area? Code: * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *  

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