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I’m pretty sure if a black hole is rotating, then it is shaped as an oblate spheroid. But I know that the equations of general relativity tell that instead of having just one radius. In location of the event horizon, there are two radii. So I don’t know whether it is a flat disk or rather an oblate spheroid.

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  • $\begingroup$ You're asking about the shape of a rotating black hole's event horizon? Such an object has an inner horizon and an outer horizon, as well as a region called the ergosphere. See en.wikipedia.org/wiki/Rotating_black_hole $\endgroup$ – J. Murray Feb 3 '18 at 0:07
  • $\begingroup$ I am terribly sorry about that I should have specifically stated which of these I was asking about. What is the shape of event horizon on the inside. For a deeper understanding and a helpful visual aid. $\endgroup$ – KOLBY Feb 3 '18 at 0:17
  • $\begingroup$ In a very real sense the shape of a black hole is the spacetime metric rather than any horizons. The latter may be more visible, but they are not the black hole itself. $\endgroup$ – Anders Sandberg Feb 3 '18 at 10:20

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