Mathematics, 21.10.2020 20:01 aebacchieri

The circumference of a circle varies directly as the diameter of a circle. When the diameter of a circle is 5, the circumference of the circle is approximately 15.7. What is the approximate circumference of a circle with a diameter of 9? Round answer to the nearest tenth. 2.9
8.7
28.3
706.5

Please give me an answer and an explanation.

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