Question

I don't want the answer of this question, I want the concept
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Answer 1

Answer:

180° is the answer ......

Answer 2

If it's of a human, see the concept.

Imagine kro, ki tum akele ek road men chal rhi ho, and tum north ki taraf chal rhi ho, and tumhare shoulders, west(left shoulder) and east(right shoulder)men hain, when you are walking and you will take a turn to west direction (towards your right) then tumhara left shoulder aayega north men, and tum chalogi west men, now see the difference, when you took the turn, you changed your direction 90° right side.

HOPE THAT HELPS YOU.

$thank \: you$