Can someone please describe how to code infinite products for pi/2?

The value of π/2 can be written as the infinite product π/2 =(2/1)(2/3)(4/3)(4/5)(6/5)(6/7)(8/7)(8/9)... If we let a1= 2/1, a2=2/3, a3=4/3, a4=4/5, . . . , determine the number of factors n in the product needed to estimate the value of π/2 that is accurate to 10^-4.

Answer 1

[madhan ravi]

Might help https://www.mathworks.com/matlabcentral/answers/253778-how-do-i-approximate-the-value-of-pi#answer_198983