Pi/2 radians different from 90 deg?

[Albert Chan]

(12-14-2021 10:20 PM)Mike T. Wrote:  It seems counter intuitive but I suspect that as the value of Pi is an approximation, the later models are technically more accurate...

Let PI = approximate values of true pi, we have:

SIN(PI) = SIN(pi - PI) ≈ pi - PI

This is why machine with more internal digits of pi gives SIN(PI) an tiny number.
We can use this to pull out internal stored digits of pi, by simple rearrangement.

pi ≈ PI + SIN(PI)

see [VA] SRC#006- Pi Day 2020 Special: A New Fast Way to Compute Pi