[Blindmath] A Student's Question

Sat Nov 12 03:11:49 UTC 2016

All,

I suspect that the confusion is coming from the fact that particularly
before calculators were common many people use 3-1/7 or 22/7 as the value
for pi.  Using 22/7 is particularly more convenient when doing calculations
on paper or in one's head but is less accurate.  The decimal value of 3-1/7
is a repeating decimal of 3.142857142857 and so on and could be rounded as
3.14286.  I suspect this is the number referred to by the professor rather
than 3.14628, but I really don't understand why that number would be used on
a calculator rather than 3.14159.  Having said that, I can see where one
might multiply by 22 and divide by 7 even if that is not quite as accurate.
The professor may have had a reason for taking the approach he did.

Best regards,

Steve Jacobson

-----Original Message-----
From: Blindmath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of Sabra
Ewing via Blindmath
Sent: Friday, November 11, 2016 5:49 PM
To: Blind Math list for those interested in mathematics
<blindmath at nfbnet.org>
Cc: Sabra Ewing <sabra1023 at gmail.com>
Subject: Re: [Blindmath] A Student's Question

I have no idea where it comes from. It is 3.146 and then the 28 comes from
somewhere. I'm not the one who picked it. I just know that for basically
every math class I have been in, that is what they say to use for pie. Ask
Professor MCcarthy. He probably knows.

Sabra Ewing

> On Nov 11, 2016, at 5:45 PM, Amanda Lacy via Blindmath
<blindmath at nfbnet.org> wrote:
> 
> How do you get 3.14628 by rounding 3.14159...?
> 
> Amanda
> 
>> On 11/11/16, Sabra Ewing via Blindmath <blindmath at nfbnet.org> wrote:
>> All right, it is it repeating then, but a lot of math classes are using
>> 3.14628 if you don't have a Calculator with the pie button. I guess that
is
>> a rounded value or something. And it's the Sa circumference to the
diameter.
>> You were quibbling over the decimal number when that is more important.
>> 
>> Sabra Ewing
>> 
>>> On Nov 11, 2016, at 2:05 PM, Bill Dengler <codeofdusk at gmail.com> wrote:
>>> 
>>> 3.14628 repeating?
>>> No Sabra. NO.
>>> http://enwp.org/pi
>>> 
>>> Bill
>>>> On Nov 11, 2016, at 7:36 PM, Sabra Ewing via Blindmath
>>>> <blindmath at nfbnet.org> wrote:
>>>> 
>>>> Yes, that is for six followed by P. It is not the word pie. It is a
Greek
>>>> symbol that has a constant of 3.14628 repeating. Someone came up with
it
>>>> by comparing a circles ark to its circumference or something like that.
>>>> 
>>>> Sabra Ewing
>>>> 
>>>>> On Nov 11, 2016, at 9:40 AM, Zach via Blindmath <blindmath at nfbnet.org>
>>>>> wrote:
>>>>> 
>>>>> When I use the Nemeth tutorial on my BrailleNote Apex it says '46
1234'
>>>>> is
>>>>> pi.
>>>>> 
>>>>> Zachary Mason
>>>>> M.S. Student
>>>>> Animal and Dairy Sciences
>>>>> Mississippi State University
>>>>> 
>>>>> -----Original Message-----
>>>>> From: Blindmath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of
>>>>> derek
>>>>> riemer via Blindmath
>>>>> Sent: Thursday, September 29, 2016 1:35 PM
>>>>> To: Blind Math list for those interested in mathematics
>>>>> <blindmath at nfbnet.org>
>>>>> Cc: derek riemer <Derek.Riemer at Colorado.EDU>
>>>>> Subject: Re: [Blindmath] A Student's Question
>>>>> 
>>>>> No.
>>>>> 
>>>>> .p would probably be written as (46, 56 1234) or maybe evenn (456 256
>>>>> 1234)
>>>>> 
>>>>> I've never seen this in mathematics though. I don't know if it's
valid.
>>>>> 
>>>>> 
>>>>>> On 9/29/2016 12:15 PM, ALLEN PURVIN via Blindmath wrote:
>>>>>> Hi,
>>>>>> A student asked me a Nemeth question and I do not know the answer. I
>>>>>> am
>>>>> sure people here do, so thank you.
>>>>>> What is the difference between .p (decimal point, p) and pi (the
Greek
>>>>> symbol) in Nemeth?  Aren't they both 4,6; 1,2,3,4?
>>>>>> I understand that in context, the distinction may be more clear.  But
>>>>> without?
>>>>>> Thank you,
>>>>>> - allen
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>>>>> 
>>>>> --
>>>>>
------------------------------------------------------------------------
>>>>> 
>>>>> 
>>>>>  Derek Riemer
>>>>> 
>>>>> * Department of computer science, third year undergraduate student.
>>>>> * Proud user of the NVDA screen reader.
>>>>> * Open source enthusiast.
>>>>> * Member of Bridge Cu
>>>>> * Avid skiier.
>>>>> 
>>>>> Websites:
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>>>>> 
>>>>> email me at derek.riemer at colorado.edu
>>>>> <mailto:derek.riemer at colorado.edu>
>>>>> Phone: (303) 906-2194
>>>>> 
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