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October 26th, 2017, 07:45 PM  #1 
Newbie Joined: Oct 2017 From: new zealand Posts: 1 Thanks: 0  Calculate the area of a concaved irregular decagon
Hi everyone Can anyone show me how to calculate the area of a concaved irregular decagon i have uploaded and attached an image of the shape Any help would be greatly appreciated Kind Regards Mat 
October 26th, 2017, 07:53 PM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,834 Thanks: 650 Math Focus: Yet to find out. 
Are you sure the software used to produce that doesn't have a function for calculating the area?

October 27th, 2017, 03:51 AM  #3 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 
You can't calculate the area of such a figure just from the side lengths. You could, for example, take any three consecutive points and "flip" the middle point over the straight line between the other two points, changing "concave" to "convex" and viceversa. That would change the area of the figure without changing side length. You need to know the angles as well.

October 27th, 2017, 04:49 AM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
Whadda heck are the +'s ???


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area, calculate, concaved, decagon, irregular 
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