>>

let me ask u a yes no question: is this all for me?`ami chaina kisu jon er jonno grp er abohawa change hok!<<`

if yes then i wont be in math_club again.

FAHIMwrote:*mahbubul hasan <shanto86@...>*`[``>>``i said and again saying, if u r half speking, keeping half in ur inside then it is not our task to guess the rest half!`

ager mail e ami abar ki korlam? ami to pura kothai bolsi. karo to bughte somossa hoise bole mone hoy na. karon ami ekta reply o paisi. apnar somossa hoy keno?\

]`dekho ami ei kotha bolsi: tomar ager mail er vitti te, tumi ek mail er rag arek mail e jharba tato hobe na...............``ar jai hok, kon mail e ki likhso sheta ami jante chaina,``PI niye ja hobar hoise....... shobai pondit hoise sheta to ami valo motoi dekhte pachchi....... keo karo vul shikar kortese na........ keo thik kotha bolle sheta vul banaitese ek jon... juktir upor arek jukti..... bujhlam shobai try kortese but keo karo proti no respect!!!``ANYWAY,``ei topic ekhon bad! SHOMPURNO BAD! ar ektao mail ami dekhte chai na eta niye....``ar keo barabari korle kintu porinoti kharap hobe! ami chaina kisu jon er jonno grp er abohawa change hok!``it is serious mail!``Now, is there any camper of 05 here who joined here new? come forward and give ur identity!``Mahbub`wrote:*Fahimul Islam <fahim_com@...>*`>>first let me know how u can compute 2pi*r without using the fact 2pi.`

amar mail e ami ei prosner ans disi. taile "`ur mail is totally absurd!" bola ki thik holo?``ami bolsi,"``i think ,bfor mailing u should read class 9-10 's books carefully. the``compute 2pi*r without using the fact 2pi,"``ami amar mail e oi (red coloured) line ta dite chai ni. oita kotha teke aslo amar kono dharona nai.`

>>`i said and again saying, if u r half speking, keeping half in ur inside then it is not our task to guess the rest half!`

ager mail e ami abar ki korlam? ami to pura kothai bolsi. karo to bughte somossa hoise bole mone hoy na. karon ami ekta reply o paisi. apnar somossa hoy keno?\

FAHIMwrote:*mahbubul hasan <shanto86@...>*`did u read the mail that i replied to oni/TZ's mail? if so then ur mail is totally absurd!``and``>>i think ,bfor mailing u should read class 9-10 's books >>carefully. the``compute 2pi*r without using the fact 2pi,`

u should write down ur english more carefully. i am not at such stage that 9-10 book will be available for me, and i am not super computer either to remember everything. even, i have reputation (!) of forgetting everything! u read that oni/TZ's mail right? u better read that again, and just see how clr that was. i said and again saying, if u r half speking, keeping half in ur inside then it is not our task to guess the rest half!`Mahbub`wrote:*Fahimul Islam <fahim_com@...>*`>>``bfor mailing u should read the mail carefully.`

i think ,bfor mailing u should read class 9-10 's books carefully. the`compute 2pi*r without using the fact 2pi,`

>>`first let me know how u can compute 2pi*r without using the fact 2pi.`

the soln is in those books.

jaihok ami dissi,

eki kendro (let O) bisisto duti bitto ase. bitto doyer poridhi ke n>1 sonkhok soman onshe vag kori. mone kori bihottoro bitte bindu gulo A, B, C, D,..... & khudrotoro bitte bindugulo a,b,c,d..... ebong A,b,O; B,b,O; C,c,O ....bindugulo somorekho.`A,b,O; B,b,O; C,c,O ..... jog ko`ri.ekhon trivug OAB & oab sodrisso (i hope u could prove that) ebong somodibahu.

tai,

AB/ab=OA/oa=OB/ob=R/r [boro bitter basardho=R ,soto bitter basardho=r]

eki vabe,

BC/bc=R/r, CD/cd=R/r......

orthat,

AB/ab=BC/bc=CD/cd=.............=R/r

=> (AB+BC+CD+......)/(ab+bc+cd+....)=(2R)/(2r)

ekhon n tend_to infinity hole,

AB+BC+CD+......=boro bitter poridhi=P

ab+bc+cd+.........=soto bitter poridhi=p

orthat, P/p=(2R)/(2r)

=>P/(2R)=p/(2r)

ekhon dekha jasse je kono bitter poridhi ar baser onupat soman. sei onupat take dhora hoy pi.

tahole kono bitte.

poridhi/bas=pi

=> poridhi/(2r)=pi

=>poridhi=2pi*r

is this soln ans your Q?

FAHIMwrote:*mahbubul hasan <shanto86@...>*`bfor mailing u should read the mail carefully.``first let me know how u can compute 2pi*r without using the fact 2pi,``second, he used the fact 2pi*r right? my opposition is there. if u can show 2pi*r as perimeter without using the fact 2pi rad at centre of circle then OK. but if not then not until u prove 2pi fact.``mahbub`wrote:*Fahimul Islam <fahim_com@...>*`u said>`

"but it steel assumes that the circle has 2pi radian at its center. (in the process of computing 2pi*r it is used. so it would be better if there is some process in which nothing special is used)"

eta thik na. amra 2pi*r compute korar somoy eta assume na korleo pari. chesta kore dekhlei apni bughben. eita assume na kore proman korte na parle amke inform koren.

apne bolsen>

"`we know the def of radian. but yet we don't know whether the circle creates 2pi rad angle at centre or not."`

kintu ami ekta bapar bughtesi na. MTZ to 2*pi radian er kotha bole ni se bolse 360 degree er kotha.(MTZ er mail ta ar ekbar kore dekhen) jodio 2*pi redian=360 degree. apni apnar mail e 2*pi bolte ki 360 degree er kotha bughaisen?

FAHIMwrote:*mahbubul hasan <shanto86@...>*`[``A circle holds 360 degree (or degrees?) at its centre.``Now, as 2*pi*r holds 360 so`**r holds**180/pi.`Thus radian is proved as constant`

]`here r means arc r right? if so then the proof seems ok.``but it steel assumes that the circle has 2pi radian at its center. (in the process of computing 2pi*r it is used. so it would be better if there is some process in which nothing special is used)``my Q is that: we know the def of radian. but yet we don't know whether the circle creates 2pi rad angle at centre or not. that's why i am not feeling ok using this fact.``Mahbub`wrote:*Fahimul Islam <fahim_com@...>*`i cant understant what is shanto vai talking about. u said,"`but he has assumed that the circumference of a circle is 2*pi*r and it could be proved without knowing that the radian is a constant angle. he also has assumed that`u here assumed that the circle has 2pi radian at centre".`(apnar last Question = ? amio bughi nai)`A circle holds 360 degree at its centre. it comes from the defination of right angle/90 degree.`

so i cant find any wrong with this prove.

shanto vai, amar vul dhoray diben? plese?

FAHIMwrote:*Ishtiaque Ahmed <onikett@...>*`In our book they draw a 90 deg cone in the centre and written that the 90 deg cone has created a poridhi of pi*r/2. That means that they assumed that the total poridhi is 2*pi*r``What did you mean by your last question at the end of your mail?``Oni`wrote:*mahbubul hasan <shanto86@...>*`there is a fact, u here assumed that the circle has 2pi radian at centre. can we assume this? if we can then ok no prob.``i don't know how the book proved it, look at that, if they did not assume something like this then their soln is better.``we know the def of radian as arc of radius length creates 1rad at centre. if so then will the circle be be 2*pi rad at centre?``Mahbub`wrote:*Ishtiaque Ahmed <onikett@...>*`To me the proof is absolutely right.``I also don't find any reason why the proof given in our math books are so complex``I think those who have written books haven't thought in this way.``Oni.`wrote:*fidafutz <fidafutz@...>*`Prove that radian is constant.``>> A circle holds 360 degree (or degrees?) at its centre.``Now, as 2*pi*r holds 360 so r holds 180/pi.``Thus radian is proved as constant.``Is this proof ok? If no, please show where is the wrong and if yes, then why we're taught more complex proof at school-college where there exists easier proof?``Allah Hafiz``MTZ``New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.``YAHOO! GROUPS LINKS``Visit your group "math_club" on the web.`

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`New Yahoo! Messenger with Voice. Call regular phones from your PC for low, low rates.``Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2ï¿½/min or less.``New Yahoo! Messenger with Voice. Call regular phones from your PC for low, low rates.``Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2ï¿½/min or less.``Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2ï¿½/min or less.``New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.``Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates.`

Blab-away for as little as 1¢/min. Make PC-to-Phone Calls using Yahoo! Messenger with Voice.- Let P>=5 be a prime and let r be the number of ways of placing P checkers on a P*P checkerboard so that not all checkers are in the same row (but they may all be in the same column). Show that r is divisible by P^5. Here, we assume that all the checkers are identical.

Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates. - somossa ta thik moto bughte parlam na.
wrote:*mahbubul hasan <shanto86@...>*`Let P>=5 be a prime and let r be the number of ways of placing P checkers on a P*P checkerboard so that not all checkers are in the same row (but they may all be in the same column). Show that r is divisible by P^5. Here, we assume that all the checkers are identical.``Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates.`

Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1¢/min. - P holo >= 5 ekta prime. r holo number of possible ways. kisher? P guti ke P*P size er board e boshanor jeno shob guti same row te thakte pare but not in same col.dekhao j "r" p^5 dara bivajjo. note that, all the "guti" r same.Mahbub
wrote:*Fahim <fahim_com@...>*`somossa ta thik moto bughte parlam na.`wrote:*mahbubul hasan <shanto86@...>*`Let P>=5 be a prime and let r be the number of ways of placing P checkers on a P*P checkerboard so that not all checkers are in the same row (but they may all be in the same column). Show that r is divisible by P^5. Here, we assume that all the checkers are identical.`

`Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates.`

Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1¢/min.

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