# data[].attributes.body
The Indian mathematician Aryabhata used a value  3.1416 in his Āryabhaṭīya (499 AD).

# data[].attributes.body
definition of π :

The circumference divided by the diameter of a circle is π, no matter how large or small the circle is!
https://en.wikipedia.org/wiki/File:Pi-unrolled-720.gif

# data[].attributes.body
Draw a circle, or use something circular like a plate.

Measure around the edge (the circumference)
say, you got 82 cm

# data[].attributes.body
Measure across the circle (the diameter)
say, you got 26 cm
Divide:

82 cm / 26 cm = 3.1538...

That is pretty close to π. Maybe if you measured more accurately?

# data[].attributes.body
Approximation

A quick and easy approximation for π is 22/7

22/7 = 3.1428571...

But as you can see, 22/7 is not exactly π . In fact π is not equal to the ratio of any two numbers. π is an IRRATIONAL NUMBER.