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Mekhanik [1.2K]
3 years ago
7

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 nearest tenth.
Mathematics
2 answers:
Naya [18.7K]3 years ago
5 0

Answer:

20.3 units

Step-by-step explanation:

Write and solve an equation involving ratios:

 5 units       15.7 units

------------- = ----------------

 9 units             C

Cross-multiplying, we get 5C = 9(15.7), with C measured in "units."

Then 5C = 141.3, so that C = 141.3 units   /   5   =   20.3 units.

mojhsa [17]3 years ago
5 0

Answer: 28.3

Step-by-step explanation:

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