World News | Edited by Abhimanyu Bose | Wednesday March 14, 2018
Today's Google doodle celebrates the 30th anniversary of Pi day. Pi day, observed on the 14th of March every year, celebrates the mathematical constant Pi. Pi represents the ratio of a circumference of any circle to its diameter, which has been calculated to approximately 3.14159. No matter the size of the circle, this ratio stays the same.
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