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16 February, 00:54

The circumference of a circle varies directly as its diameter. When the diameter of a circle is 6 inches the circumference is 18.84 inches. Which equation describes y, the circumference of a circle when the diamete is x?

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Answers (2)
  1. 16 February, 01:07
    0
    6y=18.84x

    Step-by-step explanation:

    Set up a proportion for the circumference to diameter ratio:

    6/18.84=x/y

    Cross multiply and you get the answer.
  2. 16 February, 01:18
    0
    Spoilers!

    This relation is PI or 3.14

    Circumference / diameter is PI

    so it should be 3.14159

    and it is because 18.84/6 is 3.14

    equation is y/x = 3.14

    when y is circumference and x is diameter
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