the diameter would be 6.
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If "3 inches" refers to the circle's diameter, then the radius is one-half of that.
6 ft
Diameter of circle = 2 * Radius of the circle.
A diameter of a circle is twice the length of a radius. Think of a diameter as two radii, both originating at the center of the circle and extending out at 180 degrees to each other to reach the edge of the circle. In this example, if the radius is 1.5, the diameter would be 3.
Since diameter is twice its radius, the radius of this circle would be 60