A Non-serous Question

[BigH]

G'day all ! ! !

Having a bit of fun with one of my colleagues . . when using "pi" in a calculation - do most of you use 3.14 - or 3.14159 or . . . Has anyone seen ASTM or EN actually define the "pi" value in calculations. I can't seem to find anything . . .

 

[emmgjld]

I almost always use 3.1415926 just because I memorized it in college, to put on the Hollerith cards.

 

[SlideRuleEra]

On a slide rule, the answer "depends"...

If pi is entered in a calculation, 3.14 is as good as it gets on a 10" model.

However, on an engineering rule certain scales start with pi. In that case, accuracy is determined by how well the rule manufacturer made the markings.

 

[geotechguy1]

In rough hand calcs I often use 3.14, for anything done electronically in excel or mathcad, the full on implementation of pi in the computer

 

[GeoEnvGuy]

Calculator has pi button and excel uses pi

 

[Mccoy]

My mind has become so lazy in calculations that I always use a spreadsheet, even when simply adding figures.
My answer consequently is that I use the automatic pi() function when needed.