Find the logarithm using the change of base formula. log(π)90 (round to four decimal places)

Find the logarithm using the change of base formula. log π 90 (round to four decimal places) I don't understand how to use pie with this formula please help. Thanks

The change of base formula is

log_a(x) = log_b(x)/log_b(a)

Plug in a = pi, x = 90, and b (the other base) being either of the standard bases, either log-10 or natural log. Let's say natural log.

Then log_pi(90) = ln(90)/ln(pi).

And you presumably have a way to calculate ln(90) and ln(pi).

If pi is the base, simply divide the log of 90 by the log of pi. If ten is the base, take the log of 90 times pi.