Who invented $\pi$?

Hint: The number \[\pi \] is a mathematical constant . It is defined as the ratio of a circle's circumference to its diameter, and it also has various equivalent definitions. It appears in many formulas in all areas of mathematics and physics. The earliest known use of the Greek letter \[\pi \] to represent the ratio of a circle's circumference to its diameter was by Welsh mathematician William Jones in \[1706\] . It is approximately equal to \[3.14159\]. It has been represented by the Greek letter "π" since the mid- \[18\]th century, and is spelled out as "pi". It is also referred to as Archimedes' constant.

Complete step-by-step answer:
Being an irrational number , \[\pi \] cannot be expressed as a common fraction , although fractions such as \[\dfrac{{22}}{7}\] are commonly used to approximate it. Equivalently, its decimal representation never ends and never settles into a permanently repeating pattern . decimal digits appear to be randomly distributed , and are conjectured to satisfy a specific kind of statistical randomness.
It is known that π is a transcendental number . it is not the root of any polynomial with rational coefficients. The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge.
 Around 250 BC, the Greek mathematician Archimedes created an algorithm to approximate π with arbitrary accuracy.

The best-known approximations to \[\pi \] dating before the common era were accurate to two decimal places; this was improved upon in Chinese mathematics in particular by the mid-first millennium, to an accuracy of seven decimal places. After this, no further progress was made until the late medieval period.
Based on the measurements of the Great Pyramid of Giza some Egyptologists have claimed that the ancient Egyptians used an approximation of \[\pi \] as \[\dfrac{{22}}{7}\] from as early as the Old Kingdom.

Note: \[\pi \] is commonly defined as the ratio of circumference of a circle C to its diameter d i.e. \[\pi = \dfrac{C}{d}\]
The ratio \[\dfrac{C}{d}\] is a constant regardless of the circle's size. Being an irrational number , \[\pi \] cannot be expressed as a common fraction , although fractions such as \[\dfrac{{22}}{7}\] are commonly used to approximate it.