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Old 09-18-2008, 04:39 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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Old 09-18-2008, 04:49 PM   #2
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Another math question


a^2 + b^2 = c^2

30^2 + 20^2 = c^2

c^2 = 1300

c=36.0555

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Old 09-18-2008, 04:50 PM   #3
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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
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Old 09-18-2008, 05:04 PM   #4
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Another math question


Yep, feller by the name of Pythagoras came up with it...
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Old 09-18-2008, 05:41 PM   #5
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Another math question


Quote:
Originally Posted by MacRoadie View Post
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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