Respuesta :
10 yards because a square has 4 sides and all four sides are equal and so 40 divided by 4 equals 10
a - the length of the square
A perimeter of the square: P = 4a
therefore
4a = 40yd |:4
a = 10yd
A perimeter of the square: P = 4a
therefore
4a = 40yd |:4
a = 10yd