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09-18-2008, 03:39 PM   #1
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## 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

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09-18-2008, 03:49 PM   #2
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a^2 + b^2 = c^2

30^2 + 20^2 = c^2

c^2 = 1300

c=36.0555

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 09-18-2008, 03:50 PM #3 Member   Join Date: Mar 2008 Posts: 88 Rewards Points: 75 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

 09-18-2008, 04:04 PM #4 General Contractor     Join Date: Apr 2008 Location: Orange County, CA Posts: 76 Rewards Points: 75 Yep, feller by the name of Pythagoras came up with it...
09-18-2008, 04:41 PM   #5
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Quote:
 Originally Posted by MacRoadie Yep, feller by the name of Pythagoras came up with it...

that names sounds familiar, was he in my geometry class??? And I thought I'd never use all those formulas...

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