Nope. Half the diameter is the radius. Circumference is the distance around the edge.
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Divide circumference by pi, that gives diameter. Radius is half of diameter
A circle with a diameter of 6 has a circumference of 18.85. Half of that is 9.425
pi X diameter finds the circumference so circumference divided by pi will leave the diameter. half the diameter to find the radius
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
the circumference is 3 1\2 (3 and a half)