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Pi (π)
THEORY & MATHEMATICSbeginner
Definition
The mathematical constant approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter. Pi is used whenever architects or engineers calculate the geometry of circular or curved elements — domes, arches, columns, and curved plans.
Example
Designing the circular oculus of the Pantheon (diameter 8.7m) requires pi to calculate the precise curvature of the surrounding concrete dome and the area of light it admits at different times of day.