thats cool did you want to ask a question though?
It also means that any angle that is not marked could be acute, right, or obtuse. For example, if this diagram appears without further comment
Well, things like sporting events, or freak storms are measured in days, or weeks. Depends. For weather, it could be hurricanes, tornado's, or even large fires(not quite weather, but could be)
what? idk, this is int even math.