Answer
$3.6193$
Work Step by Step
Apply the Change of base property: $\displaystyle \quad \log_{b}M=\frac{\log_{a}M}{\log_{a}b}$
Change to base 10 (common logarithm)
$\displaystyle \log_{\pi}63=\frac{\log 63}{\log\pi}\approx 3.6193$
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