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Illustration of a circular diagram showing a circle with a radius of 9 meters, labeled with the formula for circumference (C = 2πr) and the calculated value of C.

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Question: if the r=9 m, then C=

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To find the circumference (\(C\)) of a circle when the radius (\(r\)) is given, use the formula: \[ C = 2\pi r \] Given: \( r = 9\, \text{m} \) So, \[ C = 2 \pi \times 9 = 18\pi\, \text{m} \] If you want a numerical value, use \( \pi \approx 3.14 \): \[ C \approx 18 \times 3.14 = 56.52\, \text{m} \] **Final Answer:** \[ \boxed{C = 18\pi\, \text{m} \approx 56.52\, \text{m}} \]

Answered by gpt-4.1

May 9, 2025, 9:07 a.m.

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This article was generated in part by one of OpenAI’s large-scale language-generation model, answering user aus's question. Images were generated with OpenAI's AI model, DALL·E 3. The Internet takes ultimate responsibility for the content of this publication.
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Published: Friday, May 9, 2025

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