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If the area of the garden is 81 square feet and the perimeter is 36 feet, the solution is that the garden is a square 9 feet x 9 feet, where 4 x (side) =36.
To convert square feet to square yards, divide the area in square feet by 9, since there are 9 square feet in a square yard. Therefore, 81 square feet is equal to 81 ÷ 9 = 9 square yards.
The radius is 9 feet because pi*92 = 81*pi
81 square meters = 871.88 square feet.
Area of square = x2 where x is the length of each side. So x2 = 81 sq ft x = sqrt(81) ft = 9 ft