A 24x24 tile is 4 square feet. You would need 105 of them.
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The radius of a circle, if its circumference is 420 feet, is 66.8 feet.
420 square feet (28 x 15 = 420).
420 - 240 = 180
420ft*100ft = 42000 sq ft = 0.964 acres
Most scientists would call that a "420-gon." Technically, it could be called a "tetrahectaicosigon."