##(3pi)/8## radians ##= 67.5^@##
The standard ratio is ##(180^@)/(pi radians)##
##(3pi)/8 radians##
##color(white)(XXX)=(3 cancel(pi))/8 cancel radians xx (180^@)/(cancel(pi) cancel( radians)##
##color(white)(XXX)=(540^@)/8##
##color(white)(XXX)=67.5^@##