There is a huge difference between not serving society and harming society.
Couch potatoes might not serve society. People who don´t pay their taxes might not serve society. Everyone short of an inspirational philanthropist could be said to be serving themselves rather than serving society.
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It is polite, it helps to maintain order in a civilized society, and it keeps the other polite, civilized people in line from beating the snot out of you.
Because when they do that it brings shame to the society
No. Children spend most hours of their day at school, and afterwards have many hours of homework. If school days were to be longer, homework should be banished allowing children to be able to socialise
In such problems, you should convert everything to the same unit - in this case, to millimeters or to meters. Then it should be easy to compare the two measurements.
Yes. What you should watch out for is that, to form a triangle, none of the segments should be longer (or as long as) the other two segments combined. Just check whether the longest segment is longer than the sum of the other two - if it is, then you can't form a triangle.