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Is $\pi$ the same in every universe?
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Firstly, it is important to remember that $\pi$ is a ratio.

$C = \pi \cdot d$

where $C$ is the circumference and $d$ is the diameter of a circle. It implies that:

$\pi = \dfrac{C}{d}$

Thus this ratio will always be constant regardless of continent or planet.
by Diamond (55,174 points)