900 feet.
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The formula, when the radius is known, is: A = PI(r)2 A circle with a radius of 450 mm has an area of 636,172.51 square mm.
There are 12 inches in one foot. Therefore, 450 inches is equal to 450/12 = 37.5 inches.
One foot is equal to 12 inches. Therefore, 450 feet is equal to 12 x 450 = 5400 inches.
450 sq ft = 64,800 sq inches.
There are only 360 degrees in a circle.