change the length of the radius
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The size of the circle is a function of the height of the rectangle.
There is no 180' circle that would be half a circle. A complete circle is 360 degrees A circle is 360º no matter what its size is.
It depends on what you mean by a certain size circle. If the certain size is the diameter, then the answer is 54 inches. If the certain size is the radius, then the answer is 108 inches. If the certain size is the circumference, then the answer is 54 / 3.14159 or about 17.19 inches
A square with sides of 0.4985 units will fit in the circle.
It is 8.5 mm, of course!