Answer:
2√45units
Explanation:
Area of the rectangle = Length × Width
A = LW
If the Length of a rectangle is twice the width, then;
L = 2W
A = 2W(W)
Since area = 90
90 = 2W²
W² = 45
W = √45
Get the length
L =2W
L = 2√45 units
Hence the length of square is 2√45units