A square will always be larger than a circle with the same diameter. Draw a square, then draw a circle that fits inside the square exactly (that is, each of the four points shared by the two shapes exactly bisect each line of the square). The square contains the entire circle, plus all the extra area in the corners.
the square
20 square feet.
58.33 square feet
190 square feet
"Feet" and "square feet" don't convert to each other. If they could, then you'd be able to figure out how many square-feet tall you are.
Its total surface area is 15614 square feet.
90 feet
The stones at Stonehedge that are still standing in what is called the Sarsen circle are on average 13 feet tall.
Nelson's Column is 169 feet tall.
Volume of a cylindrical tank 8 feet in diameter and 8 feet tall is pi x 16 square feet (radius squared) x 8 feet (height) = 402 cubic feet.
9 square feet = 1 square yard Area of the wall (each side of it) = 9' x 13' = 117 square feet = 13 square yards.
Based on the outer walls, the principal tower located on the south side is 91 feet high and 37 feet square. On the north side which has two towers, the taller tower is 145 feet tall, while a campanile situated at the northeast corner is 17 feet square and 117 feet tall.