Can someone work this out fer me plz

Krusty

Ello all.
A dood at work gave this to me to work it out....
Now I'm no rocket-scientist, so I thought I'd turn to all ye cyber-mathematical-whizzkid types.

I detest these sort of thing (grrr...feckin sums!?).
So....if ye can solve this please show how.
A bucket of Kudos to the winner.

Ta.

K.

Sin(pi/x) = sqrt2/2
x= integer
x=???

**in plain english...coz of missing symbols n what not:

the Sin of pi over x = the square root of 2 over 2 **

elexes

eh?!?

Wook

do your own homework !

mooman_00

Doesn't that go something like (pi/x) = cos(sqrt 2/2)
=> pi/x = cos(sqrt 1)
=> pi/x = cos(1)
=> pi = cos(x)
=> i don't have maths tables so 3.162 = cos(x)
=> go to maths tables and look up 3.162 in the cos table and you'll get your x.

p.s. im not good at maths so ive probably gone wrong somewhere (or everywhere)

Space Coyote

mmm pi

DapperGent

x= 2sin(pi)/sqrt(2)

Log tables should solve it from there I think. Theres a few standard relationships a few pages in.

Don't have one on me though.

I think 2/sqrt(2) is probaly equal to cos, sin or tan summat they usually work out simple enough from there.

hussey

Ok pi/x is an angle.

so for simplicity let pi/x = A

so equation is sinA = sqrt(2) / 2 .. call this B

so since B = 0.707

so sinA = .707
(using reverse sin function on calculator)
and sin(45) = .707 and sin(135)

pi/x = 45

now pi = 180 (I think)

so 180/x = 45
=> x = 4

also x = 1+1/3 (for 135)

DapperGent

Oh is it sin (pi) /x or sin (pi/x)?

Tyrrial

Maths make baby jesus cry!

solice

question, is it the sqrt (2/2) or the (sqrt 2)/2

if its the first one then the answer might be the "sin pi" if its the second one then its something else

i hate maths too, i got 42% in my summer exam. but yay i passed

GoneShootin

there IS a Science Board and a College Board ya know. This would be better off in there imo

KdjaCL

I have looked at that for about 10 minutes and i have absolutley no clue what it means.

Does that mean im clever


kdjac

ToxicPaddy

Originally posted by Space_Coyote
mmm pi

.... hot with loads ice cream.. yummmmm

silverside

4.

sin pi/x = sqrt2/2

pi/x is either pi/4 or 3pi/4

but x is an integer

so x is 4.

To make it easier to understand, draw a circle and note that sin is the y-coordinate of a point. also remember that there are 2pi radians in a circle.

BoyScout

Originally posted by silverside


To make it easier to understand, draw a circle and note that sin is the y-coordinate of a point. also remember that there are 2pi radians in a circle.

Nah didn't make it any easier at all!
Mind you I have always hated maths!

I'm with the hot Pi and icecream crew!:p

Stark

It's all worked out in the first few pages of the log book. Just do a simple working out to turn sqrt(2) / 2 into 1/sqrt(2) (divide above and below by the sqrt(2)).

Then you'll see, plain as the nose on your face:

sin (pi/4)=1/sqrt(2)

So x is 4.

AL][EN

Originally posted by KdjaC
I have looked at that for about 10 minutes and i have absolutley no clue what it means.

Does that mean im clever


kdjac

Same here i think it means were too clever to work it out!


seriously tho you could try googling for the answer that sometimes works

embee

Most people know Pi = 3.14

But..... 3.14 what exactly?????

3.14 inches? Centimetres? Cubic Feet?

Pigman II

Originally posted by embee
Most people know Pi = 3.14

But..... 3.14 what exactly?????

3.14 inches? Centimetres? Cubic Feet?

It's not 3.14 ANYTHING as far as I know?

Pi is simply a RATIO of the circumferance of a circle to the diameter of it and therefore has no unit definition.

Moriarty

Originally posted by Pigman II
It's not 3.14 ANYTHING as far as I know?

Pi is simply a RATIO of the circumferance of a circle to the diameter of it and therefore has no unit definition.

This man speaks the truth.

sceptre

Originally posted by hussey
Ok pi/x is an angle.

so for simplicity let pi/x = A

so equation is sinA = sqrt(2) / 2 .. call this B

so since B = 0.707

so sinA = .707
(using reverse sin function on calculator)
and sin(45) = .707 and sin(135)

pi/x = 45

now pi = 180 (I think)

so 180/x = 45
=> x = 4

Aye, that's the one

Obviously (sqrt2)/2 is the same thing as 1/(sqrt2) as well if it makes it any easier to do it in your head (root 2 being 1.4142135, reciprocal being 0.7071 & that being sin45 - easier to just remember the simple ones rather than look them up).

Ebonyks

MMMMMMM PI....e



Clickable


...sorry