✔ 最佳答案
OK What is a Kilometre?
That would be 1000 metres.
thus 66.1 km = 66,100m
Area = width x length
66,100 x 66,100 = your answer
UNLESS..... you misread the question and it is asking for the sides of a square that is 66,100 square metres.
In that case it will be the square ROOT of 66,100 on each side.
You can punch your own calculator buttons from now on.