if you have a radius in a circle do you use A=(3.14)d2
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circumference is pi times diameter (8.6 +8.6) x 3.1415926=___mm round off answer as needed
the raidus of a circle is the distance from the middle of a circle to any point.
Bob tried to find the diameter of the circle.
In a circle, the radius is half of the diameter.
you double the radius to find the diameter.