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the circumference of a circle is 120 millimeters. Which of the following inqualities is true for d, the diameter of the circle measured in millimeters? A. 10<d<20
B. 30<d<40
C. 50<d<60
D. 70<d<80

  • math -

    pi is about 3, so d is about 120/3 or 40.

    But, pi is slightly larger than 3, so d is slightly smaller than 40.

    (B)

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