Because it wouldn't matter which direction you go in first. For example would it matter if you took two steps left then three forward or if you took three forward and then two left. It wouldn't because you would end up in the exact same place.
Answer:
1/2. (0.5)
My apologies for no explanation, I just put it in my calculator.
Since 90 degrees is 1/4 of a circle then 1/4 of 12 is 12/4 = 3m^2
All you have to do is divide both sides by 2(pie)
C/2 (pie) = r
