1.Turn left 90°
2.Turn 90° to the left
Do both sentences have the same meaning and natural?
Yes. More fully "turn left through ninety degrees". Also commonly "turn ninety degrees left".
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Yes. More fully "turn left through ninety degrees". Also commonly "turn ninety degrees left".
In this (I assume) non-mathematical or non-technical usage, I would, in formal writing, prefer to write out "ninety degrees" in words. In everyday writing what you have is OK.
The sentences are missing full stops.
You have incorrectly spaced the numbered points. It should be like th