What is PI, a.k.a. "π" ?

What is “PI”, and what is its significance?  PI, designated by the Greek letter π, is a mathematical constant defined as the ratio of a circle’s circumference to its diameter.   This Circumference/Diameter ratio used to calculate π is depicted below: 


Often approximated fractionally as 22/7 or rounded to 3.14159, π is an irrational number that cannot be represented with terminating or repeating decimals.


In engineering and construction, understanding π is of critical importance, as it is impossible to build various  structures and building features without measuring or controlling critical diameter or circumference dimensions.

Aussie World Ferris Wheel (1, upper left); Leaning Tower of Pisa (2, upper right); 
St. Peter's Basilica (3, lower left); Izumo Dome (4, lower right).  

In building the Exodus Tabernacle Courtyard curtain set, the same basic understanding of π or PI is also required, as illustrated in the sketch below:  


Next Page:  Ancient PI (π)


References

1.  By Softeis (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons

2.  By Aussie world (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 4.0-3.0-2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons

3.  Giacomo della Porta [Public domain], via Wikimedia Commons

4.  https://www.flickr.com/photos/kentamabuchi/3511199478/in/photostream/


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