We know what the exact value of c is because we set it to a specific value and derive the meter from it. We can’t do that with pi, so “estimate” it is.
I don’t feel like that is the same thing. No one calculates pi by drawing a perfect circle and measuring the ratio. However, I believe we do calculate the meter by measuring the distance light travels in 1/299792458.000 seconds.
We know what the exact value of c is because we set it to a specific value and derive the meter from it. We can’t do that with pi, so “estimate” it is.
We define Pi as the ratio of a circumference to diameter in the same way
I don’t feel like that is the same thing. No one calculates pi by drawing a perfect circle and measuring the ratio. However, I believe we do calculate the meter by measuring the distance light travels in 1/299792458.000 seconds.