My Math Forum  

Go Back   My Math Forum > High School Math Forum > Geometry

Geometry Geometry Math Forum

Thanks Tree1Thanks
  • 1 Post By Country Boy
LinkBack Thread Tools Display Modes
October 26th, 2017, 08:45 PM   #1
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

Attached Images
File Type: jpg lake.JPG (18.4 KB, 9 views)
mwin002 is offline  
October 26th, 2017, 08:53 PM   #2
Senior Member
Joined: Feb 2016
From: Australia

Posts: 1,453
Thanks: 489

Math Focus: Yet to find out.
Are you sure the software used to produce that doesn't have a function for calculating the area?
Joppy is online now  
October 27th, 2017, 04:51 AM   #3
Math Team
Joined: Jan 2015
From: Alabama

Posts: 2,874
Thanks: 766

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
Country Boy is offline  
October 27th, 2017, 05:49 AM   #4
Math Team
Joined: Oct 2011
From: Ottawa Ontario, Canada

Posts: 11,057
Thanks: 721

Whadda heck are the +'s ???
Denis is offline  

  My Math Forum > High School Math Forum > Geometry

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 01:04 PM
calculate ratios of irregular polygon given angles jkavana Algebra 9 September 6th, 2011 04:02 PM
Calculate the volume of an irregular prism Henrik Algebra 2 March 19th, 2010 05:50 PM
Calculate the length of the side of an irregular tetragon. Mr Spot Algebra 15 November 20th, 2008 06:56 PM
Calculate my property area an irregular pentagon goldberry Algebra 1 July 19th, 2008 03:01 AM

Copyright © 2017 My Math Forum. All rights reserved.