# Pi

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Thread starter 16 years ago
#1
What's your favourite use of pi in mathematics?
I particularly like the formula for the volume of a sphere!
0
16 years ago
#2
i hated it. i could never work out the area of a circle in maths. i always left that question out. even on the exam.
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16 years ago
#3
Has to be e^i(pi)=-1 The best equation around and proves there is a God
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16 years ago
#4
(Original post by Phil_C)
Has to be e^i(pi)=-1 The best equation around and proves there is a God
I like national Pi day (14th of March).
This is also Einsteins birthday!
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Thread starter 16 years ago
#5
Agreed, a very pretty formula based on a tried and tested formula for any number of radians.

Does anyone know why i^i has several *real number* results?
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16 years ago
#6
(Original post by Mince Pi)
Agreed, a very pretty formula based on a tried and tested formula for any number of radians.

Does anyone know why i^i has several *real number* results?

yer because "I" love u
de dum, crash
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16 years ago
#7
wer has all the love gone?
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16 years ago
#8
(Original post by rpg)
wer has all the love gone?
I told u, over there!!!!
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16 years ago
#9
I dont really like pi. I had this really awful toffee and apple pi the other day.
Just plain apple's fine, a bit bland, but fine.
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16 years ago
#10
I hate pi! but why do we use the decimal value of pi 3.14 instaid of the correct value 22/7 ? I mean answers would be more accurate wouldn't they?
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16 years ago
#11
(Original post by jstringer)
I hate pi! but why do we use the decimal value of pi 3.14 instaid of the correct value 22/7 ? I mean answers would be more accurate wouldn't they?
Please tell me you realise that 22/7 is an approximation, to an irrational number.
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16 years ago
#12
(Original post by jstringer)
I hate pi! but why do we use the decimal value of pi 3.14 instaid of the correct value 22/7 ? I mean answers would be more accurate wouldn't they?
pi is irrational, therefore 22/7 cannot be accurate.
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16 years ago
#13
(Original post by Mince Pi)
Agreed, a very pretty formula based on a tried and tested formula for any number of radians.

Does anyone know why i^i has several *real number* results?
i^i = e^(i ln i)

ln i = i(2n-1)pi

i^i = e^(- (2n-1)pi)

the n causes different solutions.
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16 years ago
#14
mmmmmmmmmmm Pi
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16 years ago
#15
(Original post by DJ Hammer)
mmmmmmmmmmm Pi
it's what third base feels like.
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16 years ago
#16
why is Pi called Pi?
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16 years ago
#17
(Original post by kikzen)
why is Pi called Pi?
because some greek chose it to be so
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16 years ago
#18
Weeble and Bob might be able to help out here:
http://www.weebl.jolt.co.uk/pie.htm
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16 years ago
#19
(Original post by jstringer)
I hate pi! but why do we use the decimal value of pi 3.14 instaid of the correct value 22/7 ? I mean answers would be more accurate wouldn't they?
LOL

That is hilarious!
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16 years ago
#20
If you should ever need to remember the first 7 numbers of pi, here's a little trick (I have been mocked for this but they'll all bow to it in the end! (...Maybe))

'How I wish I could calculate pi' -Straight, or 'How I wish I could calculate pie' -to round it up.
How- 3 I- 1 wish 4 I-1 could-5 calculate-9 pi-2/pie-3
3.141592/3

Cunning ey?! :P
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