SOLUTION: I'm trying to measure (in acres) the area of a lake to determine how much chemical per acre to use to clear up some weed problems we're having... I used a satellite photo from goog

Question 192162: I'm trying to measure (in acres) the area of a lake to determine how much chemical per acre to use to clear up some weed problems we're having... I used a satellite photo from googlemaps and then used the perimeter measurement tool in Adobe Acrobat 9 pro... Unfortunately, the new version of Acrobat 9 pro doesn't easily let you re-set the embedded scale ratio (DARN!)
So, here's my question:
The scale is .94" = 100 ft.
The perimeter measurement = 14.31"
How many acres is the lake? (I'm not talking acre feet... just acres)
If you want to see a PDF of the problem I can send it to you... if I had an address.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Well, there's a fundamental flaw with your method you used to find the area. You measured the perimeter of the lake which does NOT give you the area of the lake. I'm assuming that the lake is in an irregular shape (ie it's not a circle or an ellipse), so calculating the area might be tricky. You could approximate it by laying out a grid and estimating the area that way (maybe Adobe Acrobat has a feature like this??). I'm sure there are other methods, but that's all I can think of so far.
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