π is the ratio of a circle's circumference to its diameter. It has been studied since ancient times, with Archimedes proving it lies between 22/7 and 223/71. The first use of the Greek letter π to represent this ratio was by mathematician William Jones. Ramanujan later published innovative formulae for calculating π. Pi Day is now celebrated on March 14th to honor the date 3/14, with events like eating pie and wearing pi-themed clothing.

2. Pi – History and evolution

3. Definition
π is commonly
defined as
the ratio of
a circle's circum
ference C to
its diameter d
The
ratio C/d is
constant,
regardless of
the circle's size.

4. History & Evolution
In India around 600 BC,
the ShulbaSutras (Sanskrit text
s that are rich in mathematical
contents) treat π as
(9785/5568)2 ≈ 3.088.
π is sometimes referred to as
"Archimedes' constant“
Archimedes proved that
223/71 < π < 22/7
ARCHIMEDES

5. William Jones
The earliest known use of the
Greek letter π to represent the
ratio of a circle's circumference
to its diameter was by
mathematician William Jones
in his work a New Introduction
to the Mathematics
WILLIAM JONES

6. The fast iterative algorithms
were anticipated in 1914, when
the Indian
mathematician Srinivasa
Ramanujan published dozens
of innovative new formulae
for π, remarkable for their
elegance, mathematical depth,
and rapid convergence. One of
his formulae, based on modular
equations, is
S. RAMANUJAN

7. PI DAY
Pi Day is celebrated on
March 14th around the
world. The earliest known
official or large-scale
celebration of Pi Day was
organized by Larry Shaw in
1988 at the San Francisco
Exploratorium
LARRY SHAW

8. How to celebrate pi day?
Pi Day has been observed
in many ways, including
eating pie food, wearing
pi T- Shirt etc. The town
of Princeton, New Jersey,
hosts numerous events in
a combined celebration
of Pi Day and Albert
Einstein's birthday, which
is also March 14.

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