Circumference

What is the approximate circumference of a circle with a diameter of 10? Use 3.14 for pi (DO NOT ROUND)

Which circle has a greater circumference, (OPTION 1) a circle with a diameter of 10 or (OPTION 2) a circle with a radius of 6? [Type "1" for OPTION 1 or "2" for OPTION 2]

The constant pi is equivalent to which ratio (where c is the circumference, r is the radius and d is the diameter of a circle)?

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