A square whose diagonal is the diameter of the circle. So, if it is a circle with diameter 18 units then the diagonal of the square is 18 units and so its side is 9*sqrt(2) = 12.7 units.
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A circle with a diameter of 18 feet has an area of 254.5 square feet.
Area of circle: 18pi Radius of circle: square root of 18 = 3 times square root of 2 Using Pythagoras' theorem each side of the square is 6 units in length
The area of a 18-inch diameter circle is: 254.5 square inches.
Area of circle: 81*pi square feet
The area of a circle, if the diameter is 18 yards, is: 254.5 square yards.