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#flo #inclass
1 ayo?
on non-uclidian geomomatrey, you can have a circle whose radius is longer than the circumfrance / 2pi if the radius is longer, we call this "positive curvature" if it's less, we call it "negative curvature"
we have to imagine projecting a 3d sphere into four dimensions so our surface area is not \(4\pi r^{2}\)