Night at the Museum: Battle of the Smithsonian: The Answer's Pi
Math → Constants → Pi
Larry and Amelia consult the Einstein bobbleheads for help on finding the secret at the heart of the Pharoah's tomb. Amelia realizes that the answer is Pi, and the Einsteins state the value of Pi since Larry doesn't seem to be familiar with the constant. Important to note is that Pi is not exactly the value stated by the Einsteins; it is approximately that value.