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OpenStudy (anonymous):
9. The circumference of a circle (in cm) is a function of the radius (in cm). This function is written . Which is true about this function? Answer Choices: C(4) is a circle with circumference 4 cm. C(12) is the circumference of a circle with radius 12 cm. C(9) is the radius of a circle with circumference 9 cm.
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