def _tile_perimeter_width(coord, projection):
 perimeter = _tile_perimeter(coord, projection, False)
 return (perimeter[8][0] - perimeter[0][0])

def _tile_perimeter_width ( coord , projection ) : perimeter = _tile_perimeter ( coord , projection , False ) return ( perimeter [ 8 ] [ 0 ] - perimeter [ 0 ] [ 0 ] )
get the width in projected coordinates of the coordinate tile polygon .