My Math Forum Calculate the area of a concaved irregular decagon

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October 26th, 2017, 07:45 PM   #1
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From: new zealand

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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
Attached Images
 lake.JPG (18.4 KB, 9 views)

 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 vice-versa. That would change the area of the figure without changing side length. You need to know the angles as well. Thanks from Denis
 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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