The result of your conversion between grad and 1/2 circle appears here
To convert between Grad and 1/2 Circle you have to do the following:
First divide (Math.PI/200) / (Math.PI) = 0.005
Then multiply the amount of Grad you want to convert to 1/2 Circle, use the chart below to guide you.
Symbol: gr
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Symbol: per 2 circle
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