Problem 44159. calculate PI without using pi function

There are many methods to get the pi(Ratio of circumference to diameter). You should get pi without using the pi function in MATLAB.

https://en.wikipedia.org/wiki/Pi The Chinese mathematician Zu Chongzhi, around 480 AD, calculated that π ≈ 355/113. With a correct value for its seven first decimal digits, this value of 3. 141592920 , remained the most accurate approximation of π available for the next 800 years.