
Geometry Geometry Math Forum 
 LinkBack  Thread Tools  Display Modes 
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: 1,610 Thanks: 550 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: 3,261 Thanks: 894 
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: 12,904 Thanks: 883 
Whadda heck are the +'s ???


Tags 
area, calculate, concaved, decagon, irregular 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Calculate individual interior angles of a irregular polygon  Letraset  Algebra  7  October 25th, 2011 12:04 PM 
calculate ratios of irregular polygon given angles  jkavana  Algebra  9  September 6th, 2011 03:02 PM 
Calculate the volume of an irregular prism  Henrik  Algebra  2  March 19th, 2010 04:50 PM 
Calculate the length of the side of an irregular tetragon.  Mr Spot  Algebra  15  November 20th, 2008 05:56 PM 
Calculate my property area an irregular pentagon  goldberry  Algebra  1  July 19th, 2008 02:01 AM 