'Draw the area and calculate acreage

I need to write a web application that has a function to draw and calculate acreage. I found it on youtube and have the application that can do it. Area With Dimensions ( time at 0:44)

I want to draw the area and calculate acreage.

I saw http://jsfiddle.net/eZQdE/43/

I need to do this and calculate acreage in angular.

Thank you



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