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: 

PIRatio

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.

PI

 

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.

Ferris Wheel at Aussie WorldLeaning Tower of Pisa

StPetersDomePD3510398063 8e07ecd742 b

Aussie World Ferris Wheel1 (upper left); Leaning Tower of Pisa2 (upper right); 
St. Peter's Basilica3 (lower left); Izumo Dome4 (lower right).  

In building the Exodus Tabernacle Courtyard curtain set, the same basic understanding of π or PI (approximately equal to 314/100) is also required, as illustrated in the sketch below:  

RoundCurtains

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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