1160
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The formula for converting radians to degrees is the given angle in radians multiplied by (180 degrees / pi), so in this case, 7 pi radians would be equal to 1260 degrees. (By the way, the greek letter pi isn't spelled with an e).
pi/6 = 30 degrees pi/6 = 0.523598775.... radians
Figure out the percentage that 90 degrees is of a whole circle, which is 360 degrees. 90 / 360 = 0.25, or 25%. 25% of 600 is 150 people who went abroad.
A pie chart only shows up to 100%, divided into portions.
I would say 90 degrees