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@salgood Those angles are only 90 degrees at an infintesimally small point where the line meets the curve so you could argue they dont exist
@RavenLuni @salgood Well, that's the definition of an angle, right? An infinitesimal distance away, there is no angle anymore.
@erwinrossen @salgood I always saw it as the intersection of 2 vcetors but I guess youre right
@RavenLuni @erwinrossen @salgood a square is also defined as the opposing lines have to be parallel. (As they are a subbody of a parallelogram)
@NafiTheBear @RavenLuni @erwinrossen @salgood Concentric circles are paralel to each other