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Sep 13, 2018 at 5:27 comment added Scáthach I don't understand one thing.. Shouldn't the ring expand a really instead of linearly. I think only area is expanding
Apr 7, 2018 at 13:18 comment added untreated_paramediensis_karnik @V.F. answers the OP's question "(...) but why the inner radius will become larger?". As it is currently written, your answer (@nicael), doesn't address this question.
Apr 7, 2018 at 12:40 comment added nicael @no_choice The question "why does it expand" is not an original problem, since that's what OP was told already. But OP didn't understand one thing, why wouldn't it expand in both directions (i.e., the outer radius growing and the inner radius shrinking). I've provided an intuitive explanation of why wouldn't the inner radius shrink, since it is something that OP had a problem understanding.
Apr 7, 2018 at 12:25 comment added untreated_paramediensis_karnik That's a better answer than the accepted one and currently top voted.
Apr 7, 2018 at 2:19 history answered V.F. CC BY-SA 3.0