The perimeter is 36cm square and rectangle, the width of the rectangle is 20% of the length, the area of the rectangle is the square area? Formula OK, add 30

The perimeter is 36cm square and rectangle, the width of the rectangle is 20% of the length, the area of the rectangle is the square area? Formula OK, add 30

The rectangle has 15 sides and 3 sides, with an area of 45
The length of the square is 9, so the area is 81
The area of a rectangle is 45 / 81 of that of a square