120° , All the angles add up to 180 degrees. Call the smallest angle x , so the second will be 2x and as the third is three times the second it will be 6x . We have: x + 2 x + 6 x = 180
If width is equal to length then it's a square. perimeter in this case would be 4x length of each side. that is( 4 x length)= 210.5 length= width= 210.5/4= 52.62 feet