Mathematics help needed.

[Cranfield]

I hope somebody is up on their Pythagorean theorem.

 

I need to know the diagonal measurements for a square, with each side measuring 8ft-6".

 

Thanks for the help.

[logstove]

there are three types of people in the world...................those that can count and those that can't............

 

hope this helps..........

[libs]

(8'6" ^2) + (8'6" ^2)

 

 

then sqr root of this will give you the diagonal measurment.

 

(obviously in inches)

[Gordon R]

The square of the hypotenuse of a right triangle is equal to the sum of the squares on the other two sides. Therefore the Hypotenuse is the square root of 8.5 x 8.5 - double. 72.25 + 72.25=144.5. Square root of 144.5 is 12.02.

[sambu13]

i got 144.2 inches, which i think is 12 feet more or less

[sambu13]

2:0 to the northerners

[VicW]

And the answer is:- 12.02feet or 12feet and a 1/4inch.

 

It can be calculated by the 1:1:root 2 rule for triangles with two equal sides.Hence the diagonal is 1.414 x 8.5. Or you can draw a scale square and work it out that way.

 

Hello Gordon.

 

Vic.

Edited April 3, 2009 by VicW

[webber]

I get 178.19 inches, so if I'm correct, and I'm off to double chech that 178. 3/16 Cranners

 

PS Its easier if you work in metric.

 

webber

[henry d]

12 feet 2.9 inches end of.

[Cranfield]

I went to school with Pythagoras, but he was always rambling about complicated stuff and we told him, "we don't need to learn this, it will never be any use to us".

 

Of course, at that time I didn't realise that one day I would need to accurately mark out for a concrete base.

 

Two "guesses" have it at 12ft and 1/4 inch, and webbers doing a recount, things are looking good.

[webber]

8 x 12 = 96 + 6 = 102

 

102 x 102 = 10404 x 2 = 20808, take square root = 144. 249

 

So I was wrong first time, but I did rush.

 

So to you Cranners thats 12ft ans 1/4 inch

 

webber

[The Sipe-ist]

definitely 12ft and 1/4 inch

I think!

[alexm]

Indeed sqrt((8.5^2) * 2) = 12.02082 feet = 12' 1/4"

 

OR, if you like trigonometry...

 

As both sides are equal, we know that the angles are each 45 degrees, therefore Hypotenuse = 8.5/sin(45) or 8.5/cos(45)

 

which = 12.02082 feet = 12' 1/4"

 

[Cranfield]

Thanks for the help, much appreciated.

[al4x]

of course you could just make yourself a wooden template for the base then measure the diagonals and get them equal

[Mrs Sweepy]

My god i am surrounded

By men with brains.

xxxSuzy

[davie mac]

not only big brains Suzy

Edited April 3, 2009 by davie mac

[apbuild]

Why dont you just draw it out on paper to scale Brian?

 

Try using 1cm:1ft.

 

Simple but effective. LOL.

 

Rob.

[dave1979]

i have got bowt 6inches!!! does the job though!!!!

[windrush]

Ah ha!, Apbuild - the first person with the entirely reasonable idea of using metric measurement.

 

12.02ft?? What a mad women's breakfast of a result that was and a perfect argument for a more rational unit of measurement.

 

Not for the die-hards here though, who I suspect in their heart of hearts have a secret campaign to bring back palms and cubits.

[alexm]

Ah ha!, Apbuild - the first person with the entirely reasonable idea of using metric measurement.

 

12.02ft?? What a mad women's breakfast of a result that was and a perfect argument for a more rational unit of measurement.

 

Not for the die-hards here though, who I suspect in their heart of hearts have a secret campaign to bring back palms and cubits.

 

LOL!

 

Well it doesn't really matter what the unit is, the result is always going to be a 'mad women's breakfast' to someone. Twelve foot and quarter inch is no slower to mark out than 3664mm

 

Regarding marking out at 1cm:1ft, your accuracy is going to suffer. Assuming you can draw perfectly and read your rule at ~1mm accuracy you could be +/- 1.2". That is enough of a gap in the floor of Cranners' garden shed to let 12g cartridges through. The consequences are unimaginable!

Edited April 4, 2009 by alexm