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sleepsleep

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sleepsleep
am i right?

2Y mm for the 60 degrees circle? based on my logic, i would say 2Y mm is supposed result, but you all know mathematics better than me,
07 Jul 2016, 11:06
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17249
revolution
Yes. It is a simple scaling operation. And my website has lots and lots of examples and formulas to compute the values.
07 Jul 2016, 11:11
sleepsleep

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sleepsleep
thanks for confirmation revolution,
my slow brain trying to figure out how to obtain pi value,
07 Jul 2016, 11:17
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17249
revolution
Do you mean obtain a formula for PI? Or how to find the value of PI? Either way my website can help you there also.
07 Jul 2016, 11:20
sleepsleep

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sleepsleep
yah, but i want to discover it my self, revolution.
07 Jul 2016, 11:26
YONG

Joined: 16 Mar 2005
Posts: 8000
Location: 22° 15' N | 114° 10' E
YONG
revolution wrote:
07 Jul 2016, 12:54
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17249
revolution
YONG wrote:
revolution wrote:
I will when people remember it without me reminding.
07 Jul 2016, 13:05
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
how they come to this value?
3.14159 infinite long

https://en.wikipedia.org/wiki/Pi
Quote:
the first four of these are 3, 22/7, 333/106, and 355/113. These numbers are among the most well-known and widely used historical approximations of the constant.

but how they come up with 355/113? how they discover this?
07 Jul 2016, 16:54
sleepsleep

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sleepsleep

based on eclipse, i try to see if the celestial actually want to info us,

- i suspect b-d-h equal to (x) degree circumference for circle.

- suspect a-b-d, d-b-e, c-b-e equal 60 degree

- suspect h-i length equal 3x d-e

- trying to extract data from eclipse, there got to be something this sign wanna shows us
07 Jul 2016, 22:25
YONG

Joined: 16 Mar 2005
Posts: 8000
Location: 22° 15' N | 114° 10' E
YONG
sleepsleep wrote:
but how they come up with 355/113? how they discover this?
Just trial and error.
08 Jul 2016, 03:07
YONG

Joined: 16 Mar 2005
Posts: 8000
Location: 22° 15' N | 114° 10' E
YONG
sleepsleep wrote:
- i suspect b-d-h equal to (x) degree circumference for circle.
sleepsleep wrote:
- suspect a-b-d, d-b-e, c-b-e equal 60 degree
Correct.
sleepsleep wrote:
- suspect h-i length equal 3x d-e
Correct.

08 Jul 2016, 03:28
DOS386

Joined: 08 Dec 2006
Posts: 1901
DOS386
Quote:
Just trial and error.

ERROR is better
08 Jul 2016, 09:01
YONG

Joined: 16 Mar 2005
Posts: 8000
Location: 22° 15' N | 114° 10' E
YONG
DOS386 wrote:
ERROR is better
Okay. I will use pi = 3.2 when I am in Indiana. Thanks for your advice.

08 Jul 2016, 10:18
sleepsleep

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sleepsleep
YONG wrote:
sleepsleep wrote:
- i suspect b-d-h equal to (x) degree circumference for circle.
sleepsleep wrote:
- suspect a-b-d, d-b-e, c-b-e equal 60 degree
Correct.
sleepsleep wrote:
- suspect h-i length equal 3x d-e
Correct.

the a-b-e green triangle should hold some important information, eg, how much to add to calculate circumference of 30 degree if we got b-c length

how to draw a circle,
you must have center point, R and how far you want to drag from point a to point b, degree

i could set the whole circle C is 360 cm, each degree equal 1 cm,
60 degree C is 60 cm

but the main issue is still the "relationship" between R and degree and C

but why you get 60 degree if you align 3 circles side by side?
08 Jul 2016, 16:16
YONG

Joined: 16 Mar 2005
Posts: 8000
Location: 22° 15' N | 114° 10' E
YONG
Then b-c length = 2y sin 30 degrees = 2y (1/2) = y.

Now, refer to your earlier diagram.

3y / b-d-h length = cos 30 degrees = sqrt(3) / 2
b-d-h length = 2 sqrt(3) y ...... (1)

Circumference = 2 pi (2y) = 4 pi y
60 degrees of circumference = (1/6) (4 pi y) = (2/3) pi y ...... (2)

From (1) & (2):
b-d-h length does NOT equal 60 degrees of circumference, as sqrt(3) does not equal pi/3.

09 Jul 2016, 03:24
YONG

Joined: 16 Mar 2005
Posts: 8000
Location: 22° 15' N | 114° 10' E
YONG
Refer to the attachment.

sin angle x = 2y / 4y = 1/2
angle x = 30 degrees

That's how we get 60 degrees.

 Description: Filesize: 60.3 KB Viewed: 5631 Time(s)

09 Jul 2016, 03:32
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