(1) To encircle the globe (of the earth) 180 times the length of
kilometres is required.

is basically a good source of getting and others by what you know for example if someone asked a question and you know the answer you could answer it and get some points or if you need on a question you could make a post about it and wait till someone answers it or just look up the question and see if someone else has asked about it

The answer is a. the answer is a because they’re agreeing with other people’s op