5.5 x 5.5 x pi sqin = just over 95 sqin
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The circumference of a circle that has a diameter of 23' 11" is 901.64 inches.
Area of the circle = pi*5.52 = 95.033 square inches to 3 decimal places
If the circle is 11 inch in diameter, then the length of the circle is 69.1 inches, however if the 11 inches is the circumference, then the length is 11 inches.
A circle with a radius of 11 inches has an area of 380.13 square inches.
Oh, dude, the radius of a circle is just half of the diameter, so for an 11-inch circle, the radius would be 5.5 inches. Like, it's just basic math, nothing to lose sleep over. So yeah, the radius is 5.5 inches, but who's really measuring, right?