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naraburns  nihil supernum  1yr ago (text post)   2640 thread views

Friday Fun Thread for October 28, 2022

Be advised; this thread is not for serious in depth discussion of weighty topics (we have a link for that), this thread is not for anything Culture War related. This thread is for Fun. You got jokes? Share 'em. You got silly questions? Ask 'em.

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Look at a globe. Seriously. The surface of a sphere is one of the classic examples of non-Euclidean geometry, a geometry where Euclid's 5th postulate doesn't hold. The exact description of the 5th postulate is a bit arcane (look it up on Wikipedia if you care), but it turns out to be equivalent to saying that all triangles must have corner angles that sum to 180 degrees. On the globe, if you choose a triangle with these corners: the north pole, 0 degrees E on the equator, 90 degrees W on the equator, that triangle will have all its corner angles 90 degrees, for a total of 270 degrees.

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