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I was just reading up on some astrophysics and I saw the line element (general relativity stuff) written in spherical coordinates as:

[tex]ds^2 = dr^2 + r^2(d\theta^2 + \sin\theta\d\phi)[/tex]

I don't get this. dr is the distance from origo to the given point, so why isn't ds^2 = dr^2 without the other stuff?

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# Homework Help: Line element in spherical coordinates

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