Question

$when \: do \: we \: observed \: \pi \: day$
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Answer 1

Hola mate... Here is your answer...

14 march.

Hope it will help you

Answer 2

We observe π day on 14th of March.

Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π. In 2009, the United States House of Representatives supported the designation of Pi Day.