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09182008, 03:39 PM  #1 
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Join Date: Oct 2006
Location: georgia
Posts: 292

Another math question
When I am "squaring up" a rectangle foundation etc...rather than pulling the tape diagionally until the measurment is the same, is there a formula that will tell you the correct diagonal measurement. My dimensions are 30' x 20'. Thanks

09182008, 03:49 PM  #2 
Newbie
Join Date: Jan 2008
Posts: 22

Another math question
a^2 + b^2 = c^2
30^2 + 20^2 = c^2 c^2 = 1300 c=36.0555 
09182008, 03:50 PM  #3 
Member
Join Date: Mar 2008
Posts: 88

Another math question
There is the 3 4 5 rule to determine a right angle. Start in a corner, go one way and make a mark at 3'. Then go the other way and mark at 4'. The diagonal measurement between the marks should be 5'
For larger jobs like yours, multiply the 3 4 5 by a number  for example, 5. So 3 4 5 becomes 15 20 25 hope this helps 
09182008, 04:04 PM  #4 
General Contractor
Join Date: Apr 2008
Location: Orange County, CA
Posts: 76

Another math question
Yep, feller by the name of Pythagoras came up with it...

09182008, 04:41 PM  #5 
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Join Date: Oct 2006
Location: georgia
Posts: 292

Another math question 
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