The circumference is:

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• Since the rectangle is inscribed in a circle, the diagonal is the diameter of the circle.
• Compute the diagonal using the Pythagorean theorem:
• So, the diameter of the circle is 13 cm, hence the radius is:
• C = 2\pi r = 2\pi \cdot \frac{13}{2} = 13\pi
• Thus, the circumference is:
• \boxed{13\pi \text{ cm}}

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