If the radius of a circle is 3.1, the diameter is - 6.2, Circumference - the distance around a circle, PQ is a - Chord, AB is the - Diameter, OC is the - radius , Find the circumference of a circle with an diameter of 4 is - 12.57, solve for the k in the proportion - 13.72, circumference of a circle with a diameter of 50 - 157.1,

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