3 is the bottom , 4 is the verical leg and 5 is the diagonal. Its the Pithageran therm ( not sure of the spelling) Tradesman's use thisnfor setting up the corners of walls, laying out flooring the old fashionway w/ out laser tools. Not many of the younger tradesman/ journeyman know theses simple tricks these days.
@santhramariappen9405
2 жыл бұрын
Why so long winded??
@roberthenry5851
2 жыл бұрын
Just like all teachers talk talk talk fell asleep waiting for class to start
@chetSeminole
2 жыл бұрын
And they NEVER answer question.
@stephenholmes5730
2 жыл бұрын
Complete the calculation to answer the question
@ibrahim-sj2cr
2 жыл бұрын
he did..... 4.330127018922193 going on to infinity isnt a great answer
@chetSeminole
2 жыл бұрын
@@ibrahim-sj2cr -WHEN DID HE EVER SAY 4.33012 ...??? Listened twice he never showed how to solve the 5/2^3 to get an answer.
@kalev60
2 жыл бұрын
Pythagoras: 3squre+4square=5 square even low level builders/construction workers know this by heart.
@markjakeway2035
2 жыл бұрын
An interesting line of approach. I assume that in the US it is taught that with a 30/60/90 the sides are given in that manner - x, 2x root3x ? While over here we teach the sin, cos tan of 0, 30, 45, 60,and 90 degrees and go on from there. Another puzzling thing is we write the constant first, so we would write root(3)x rather than like here - xroot(3)?
@markjakeway2035
2 жыл бұрын
@@centexan Yes but not every right angled triangle with an hypotenuse of 5 has other sides 3 and 4. In this case the angle of 30 degrees means the other sides are not 3 and 4.
@robertakerman3570
2 жыл бұрын
@@markjakeway2035 I instantly went to 5sq=25. so, 3 4 5 seemed OK. My proof was 3> 9, 4> 16. 9+16=
@jhgoh5105
2 жыл бұрын
@@robertakerman3570 Please watch and read carefully. The other 2 angles are 30deg and 60deg. For a right-angle with sides equal to 3, 4 & 5 ratio, the 2 side angles do not equal to 30deg and 60deg. Let me illustrate below. Take an equilateral triangle of each side of 5 units length. All the internal angles are 60deg. Drop a perpendicular from any point to the opposite base. This perpendicular will bisect the triangle, the angle and the opposite side exactly in half. Now you have 2 mirror image right-angle triangles with hypotenuse equal to 5 unit length, the internal angles is equal to 30deg and the opposite side equal to 5/2 unit length. Now apply Pythagorean theorem to any of the right-angle triangle with 2 known lengths of 5 and 5/2 unit length. The square length of the perpendicular = (5^2 - 5/2^2) = (25 - 25/4) = {(100-25)/4} = 75/4 The length of the perpendicular = sq root 75/4 = sq root {(25 x 3)/4} = 5/2 sq root 3 or 2.5 sq root 3
@robertakerman3570
2 жыл бұрын
@@jhgoh5105 I love it. Do U play 3 card Monty?
@davidjones-vx9ju
Күн бұрын
the classic example of a right triangle
@downburst3236
2 жыл бұрын
How to derive the formula: Mirror the triangle on the vertical line, and you end up with an isosceles triangle, where all corners are 60 degrees, and all sides are same length. So the horizontal line of the original triangle is 1/2 in length, or in other words, hypotenuse is 2 times the horizontal line.. So using Pythagoras theorem to solve for Vertical line, we get square root of (2 squared - 1 squared), that is square root of (4 - 1), which is square root of 3.
@gusdogbrownlab435
2 жыл бұрын
Isn't it a 3-4-5 right angled triangle? ........solved it 2 seconds. Pythagoras 5 squared is 25, 3 squared is 9 and 4 squared is 16. 9+16=25
@jhgoh5105
2 жыл бұрын
Wrong. The lengths of each side is 5, 2.5 and 2.5 x root 3.
@markjakeway2035
2 жыл бұрын
It is not a 3,4,5 triangle. A 3,4,5 triangle has angles approximately 37, 53 and 90 degrees, this one here is 30, 60, 90 degrees.
@Nikioko
2 жыл бұрын
Wrong.
@Nikioko
2 жыл бұрын
@@jhgoh5105 Correct.
@blumobean
2 жыл бұрын
Almost 70 years ago, my dad, uncle, and grandfather were building the home I grew up in. The list of areas that my grandfather was expert in was extensive: mechanical, electrical, carpentry, even quoted Shakespeare and knew quite a bit of Latin. I was young (about 6), but he gave me a course on the carpentry square. There is more to a square than most know, it's not just for 90 degrees. I have his old square and many more tools,, they will be my son's soon.. He explained 3,4,5 to me, without getting into square roots.
@charlenerivkin364
2 жыл бұрын
Please explain 3,4,5 sounds interesting 🤔
@BigTJK
2 жыл бұрын
3 and 4. The square of the hypotenuse is 25. 3squared =9 and 4squared =16 9+16=25 Pythag
@Nikioko
2 жыл бұрын
2,5 and 2,5√3, as we have the left half of an equilateral triangle with a = 5.
@ibrahim-sj2cr
2 жыл бұрын
you could improve your reach and help more people by making some videos short and snappy
@pgjbsn
Жыл бұрын
The short side is 3. Not 2.5. Please explain
@thomasstambaugh5181
2 жыл бұрын
Heh -- the 3-4-5 triangle is a staple of exam questions.
@kennethwright870
Жыл бұрын
2.5, 2.5sqrt3, 5
@billys6369
2 жыл бұрын
if it is a right triangle and the hypotenuse is 5 the other two sides have to be 3 and 4.
@accountingfinancemjr
2 жыл бұрын
I didn't use math, just some common snese and repetitive use; if the hyp is 5 and a^2xb^2=c^2, the sides have to be 3 and 4.
@neilmccoy9390
2 жыл бұрын
sin30 = 1/2. cos30=1/2 of square root of 3. So sides are 5 times these.
@minime1721
2 жыл бұрын
As I recall a 2(squared)+ b 2(squared) = c2(squared) 25= 9+ 16
@woodsie5474
2 жыл бұрын
Well, you just happen to be wrong. Downburst is correct. the other sides are 2.5 for the short one, and 4.330127019 for the other one.
@draken68
2 жыл бұрын
you forgot light fab, welding, carpentry or even landscaping.
@viablerenewable1638
2 жыл бұрын
My short cut is remembering the 5/4/3 right angle triangle.
@Nikioko
2 жыл бұрын
Wrong. We have half an equilateral triangle.
@johnspisak9729
2 жыл бұрын
The answer is 3 and 4.
@papavary
Жыл бұрын
Wrong, The answer is 3,4,5. The theory that the shortest side equal half the longest side is wrong.
@70CadillacMan
2 жыл бұрын
3,4,5
@Nikioko
2 жыл бұрын
Wrong
@joevip76
2 жыл бұрын
My problem is, I'll forget this tomorrow.lol
@davidchiles5331
2 жыл бұрын
4 and 3
@markjakeway2035
2 жыл бұрын
Afraid not, although a triangle with sides 3, 4, and 5 is a right angled triangle it does not have angles of 30 and 60 degrees as in this problem. From memory they are round about 53 and 37 degrees.
@davidchiles5331
2 жыл бұрын
@@markjakeway2035 try this one 4.33" and 2.5" ?
@markjakeway2035
2 жыл бұрын
@@davidchiles5331 Yes those are the sides with a 30, 60, 90 degree triangle, just as shown in the video.
@chetSeminole
2 жыл бұрын
So what is the answer??? 5/2 is not an answer it's a fraction. How do you do 5/2^3 on a calculator. I'm 54 and still have no clue what you just did.
@chetSeminole
2 жыл бұрын
According to AutoCad the bottom would be 2.5 and the perpendicular would be 4.3301. Have no idea how the 4.3301 is figured out. I'm lost, and I took notes.
@chetSeminole
2 жыл бұрын
I guess asking questions really isn't an option. Reminds me of H.S. in the 80's.
@russelljames1811
2 жыл бұрын
@@chetSeminole [5 times (square root of 3)]divided by 2 will yield approximately 4.3301...
@gw7289
2 жыл бұрын
a lot of what you say isn't about what the subject was on the chalk borad to much uneccesary talk
@thulanidlamini4399
Жыл бұрын
you good but you take half the time talking things not helping
@garykingery773
2 жыл бұрын
All that wasted time and energy and didn't post the answer I solved it in 30 seconds as 54 + 3
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