3-4-5 Triangle Method For Finding Square
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- เผยแพร่เมื่อ 18 พ.ค. 2024
- Today you will learn the 3-4-5 triangle method for an effective way to find square. The 3-4-5 triangle method works great for small projects, and it works great for large projects such as flooring, home construction, and landscaping/gardening.
Finding square with diagonals video: • Every New Woodworker N...
0:00 Intro
0:30 What is the 3-4-5 method?
1:57 Method #1 - Finding square
4:03 Method #2 - Laying out 90 degree lines
5:28 Outro
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My name is Josh Fedorka, and I’m the founder of Training Hands Academy™. I have been a carpenter and woodworker for over 25 years. I have also held certifications in home energy auditing and have built several LEED certified homes in New England.
God has gifted me with many “hands on” skills and it is my calling and purpose to share those skills by teaching others. Whether it is to seek a career in carpentry, become a general contractor or improve one’s DIY skills and knowledge, the motivation behind THA is to help others successfully learn how to work with their hands.
#diy #345trianglemethod #constructionlayout
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Notes: Sometimes the string can introduce some errors because of its flexibility. Therefore, it's always a good idea to recheck the 3-4-5 after your lines are snapped. In addition to multiplying the ratio, you can also divide the numbers to get even smaller numbers.
Representing the homeland, Tennessee! Good to see my Tennessee neighbors out here putting in work.
Use this all the time in laying out slabs and footings, wall placement, ensuring square openings. Countless uses for this method. Thank you Pythagorus
I love to these videos they are fast and to the point. You can always pause or rewind if necessary.
Your explanation is easy to follow n understand. Thank you.
I can believe I learned that today. Thank you
Excellent lesson!
Hi, thank you for the video very informative and right to the point. Question: I’m new to woodworking and I was wondering what is the best way to make plywood residuals square, always worry about the factory edge and when I loose track of it I don’t know what to do. Thanks you!
I tried watching a few different videos, but your videos I understood! Thank you.
Thank you for watching!
Thanks Josh!
Best explanation I've heard so far
As a flooring contractor, this is a method I live by every time I do lay out
I loved this tip! Thank you!
Glad it was helpful Shaun!
Thank you alot for a good lesson
Love the tips
Thank you! Been looking for a straightforward explanation and you are it. Appreciate you taking the time. Helped me out-be well...
Thank you for taking the time to comment! If you want to support my work, please drop some more comments on my other videos! This helps to wake up the YT algorithms. :)
Awesome. Thanks. Just made a bench top and need to put straight and square dog holes.
Thanks a lot! Didn't realize so easy a method.
I know right, and you can use it in so many different places.
Thanks for the video
Genius!!
well done
great
Thanks I like how you show the numbers close up now I get it
Glad to help
Thank you so much for sharing your knowledge bro
My pleasure
Very good information about square tank you
I believe you are the best channel in America .
That is very kind of you to say Elton!
Thank You
Best explanation I’ve seen 👌👌understand it fully now ,cheers buddy
Great to hear!
Show de bola! Greetings from Brazil!
Thank you! Cheers!
awesome video
Very educative
Awesome! Thank you for the comment.
Very useful
Thank You Very Much.
You are very welcome. :)
Thank you for your video is very simple and will be help me so much
Glad it helped
I can not imagine, that somebody dislikes this video! Many thanks, Josh, you keep it simple and understandable. I get it as an amateur.
I appreciate that Milan!
Thanks! I've watched a couple of your video's, all are excellent. You are the first person that I felt I got enough out of it to donate
Awe, thank you so much Jack! I really appreciate your generosity.
Mathematician here. Nice mathematical video :-) It's actually not the Pythagorean Theorem that is used in the 3-4-5 method. (I don't think the video claims this, but some comments do.) Instead, it is the converse of the Pythagorean Theorem, which says: IF the sides (a, b, c) of a triangle satisfy the equation a^2+b^2=c^2, THEN the angle opposite side c is a right angle.
In the 3-4-5 method, this is used for a=3, b=4, c=5.
For the same reason, there is also a 5-12-13 method. (And infinitely many other similar methods that are not just scaled versions of these to methods.)
Another funny thing I have noticed: Almost all woodworkers on TH-cam say "square" when they mean right angle (when two lines are perpendicular/orthogonal) :-)
:)
Shout Out From South Texas :) #New Sub :)
Welcome Robert!!
The floor layout is snazzy
Guys just start out with a any number that is a multiple of 3. Then however many times 3 goes into that number, multiply 4 and 5 by that same number. At the end, the measurement between the 3 side and the 4 side should equal 5 times whatever the number was you used to multiply with. If you start with 3x4=12. Then multiply the 4 and 5 by 4 also. 16 and then you would get 20 between the first two.
It's really really simple if you know the multiplication table.
I also say, thanks 😊🤙👍👈
No problem 👍
Thank you now I know the 345 method
Happy to help
Subscribed
Thanks!
Very nice. I have a question what if I’m working on a frame 48x24 inches, using 3-4-5 what distance do I use? 3 4 and 5 inches are too small, and 3 4 and 5 feet is too large, so guide me please.
Fantastic question Gary! Just as you can multiply to make the ratio bigger, you can divide to make it smaller. So for your project one option would be to divide the 3'-4'-5' by 2 to get 1.5'-2'-2.5'. Cool right?!
Metric!
If you prefer integers that are as large as possible (and still inches), then you can multiply by an integer n so that 3*n is at most 24, and 4*n is at most 48, i.e., you multiply by n=8:
3 becomes 3*8=24,
4 becomes 4*8=32,
5 becomes 5*8=40.
Therefore, you now have a 24-32-40 method.
It’s a ratio. It doesn’t matter what the measurements are as long as they are 3-4-5. You could use 24 on the short side, 32 on the second side and 40 on the hypotenuse. 24-32-40 is the same as 3-4-5. Better still, forget it altogether and just measure the diagonals.
very cool. it got me thinkning.. situations that are square but not 3-4-5 or a simple multiple like 6-8-10, Is it true that every square 3 sided measurement is a derivative or multiple of 3-4-5? Kind of like if a truw box is really square, divided by itself is 1. So every truly square triangle measurement would have to be equally proportionate to 3-4-5...? never thought this deep before lol
I would say yes, that is true.
What’s the chalk line cord all about? What’s its purpose and why did you “snap it” ... thanks Josh ✌🏼
Hey man! Chalk lines are used mostly in carpentry/construction and work great for laying out lines for house walls, flooring, roofing, and cutting plywood just to name a few. Great tool.
@@TrainingHandsAcademy ahhh I see! I saw one of my buddies use this the other day on a long slab but I was lost. Good to know! Thanks buddy
We use a chalk like to transfer a line to a concrete slab, sub floor or any other type of substrate in order to follow. We use this line to keep all the material straight and square, it is very important to follow. If you don’t follow your line correctly, you can have a huge mess on your hands and its a nightmare to fix if you don’t "catch it" right away.
So is run always 3 ft and rise at 4ft??? Or can we do vise vers??? Run being 4 and rise 3 ft?????
Yes, you can switch it up.
Flexible use of the Pythagorean Theorem
I’ve figured, thank you
This is like a math class.
Cool math tricks - interestingly, while the 3-4-5 Triangle method clearly speaks to Pythagorean mathematics, the diagonal method also lends a concept from another famous mathematician - Ptolemy
(as in, Ptolemy's theorem: en.wikipedia.org/wiki/Ptolemy's_theorem)
I need diagonal for 21/40 dimension metal building
Can you just divide the 5 by 2 to get a 45 degree projection?
Bad ass
I want to learn how lay a floor plan using a string of a building plan
How about big building lay out for square one.
Yes, this works for that too.
@@TrainingHandsAcademy Thank you ang can you make demo for that too?
God bless .
.25 speed is best for this
does it work in metric???
Yes, any unit of measurement
Don't worry about unit of measure. It can be something you invent. What matters is the 3,4,5 all being multiplied by the same number each time. It's much easier to understand with the short simple explanation. The longer it takes to explain this the more confusing it will get.
@@TrainingHandsAcademy thank you for the great answer, makes sense
I see the concept here, but couldn't you just use the speed square to check the angle?
You can but the speed square is too small to get accurate readings on larger projects.
Yes, but will it work for a "LEFT" triangle! 👀😆😜😁🤣👍
😂
Unfortunately not.
Or I could say yes- it will work for communists!
@@Nitecrow314 You juz had to go there! 🤣
Am not getting 5'
Then you are out of square
You don't have to go 3',4',5'. Use multiples of 3 if that works better.
Say you use 12. 3x4=12. Now multiply 4 x 4 up the other side. That's 16". Now if you measure between them you should get 20 because 5x4=20. I just used 12, which is 3x4. Then I multiplied the next two numbers also by 4. You can do it however works best for the project. Just start with any number that is a multiple of 3.
Pythagorean theory
Let's see if someone could actually do it.Not a carpenter .
Do what?
respect for share your educate
Thanks for commenting!
I did a diagonal using a single taunt string off each corner of the 36' apart stakes...stake one at (0) stake 2 at (36) 36Ft x 40Ft=54'2.75" Diag. corner to corner if memory serves me ... maybe not but ultimately when my numbers met diagonally my sides were 36 left side @ (40ft) and 38ft 6" right side @(40 ft) three times kept coming out using a 54ft 2" (same string tied off)...which corner is out is the need to know using a single string 54ft 2.75" off stake 1 @ 0 and stake 2 @36Ft? How is the parallels off ???
Got it coach!! 🫡
Very helpful thank you