If replacing all the '3's doesn't fix your code, remove the 4s, too, with 'ceiling(pi) / floor(pi) * pi * r^floor(pi)'. Mmm, floor pie.

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Check out the first video for the answer to

“What if we aimed the Hubble Telescope at Earth?”

and follow xkcd’s What If? The Video Series channel to be notified about each new video.