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# What is the reference angle of -370 degrees or ##(8pi)/3##?

##-370^o -= -10^o## This angle is ##10^o## away from the x-axis Therefore the reference angle is ##10^o##

##(8pi)/3 -=(2pi + (2pi)/3)## ##-= (pi - pi/3)## This angle is ##pi/3## away from the (negative) x-axis Therefore the reference angle is ##pi/3##