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It would be exactly 4/Pi inches. This makes it approximately 1 1/4 inches.
This question makes no sense. Therefore, you're ugly ;)
If Mark makes a circle, that circle would have a circumference of 12 inches. The formula for circumference is pi times diameter, so the circumference divided by pi will give you the diameter of 3.82 inches. Divide this by 2 to get the radius of 1.91 inches. Area of a circle is pi times the radius squared. 1.91 squared is 3.6481. Multiply this by pi to get 11.46 square inches of area inside the circle. A circle is always the most efficient use of space possible given a fixed perimeter. If Mark makes a square with equal sides where all sides are 3 inches, the area would be 9 square inches. 3 X 3 = 9
there are 36 inches in a yard.
A millimetre is a unit of measurement of length. A diameter is not. The question, therefore, makes no sense.