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Well this depends on If the radius is 40 inches or If 40 inches is the entire diameter.

Circumference is determined using the formula Pi x Radius²

Assuming 40 is only a radius it would be 3.14 x 40² or 3.14 x 1600 = 5024 inches

If 40 inches is the entire diameter then its simply Pi x Diameter since the entire diameter is the radius squared. 3.14 x 40 = 125.6 inches.

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Q: What is the circumference of 40 inches?
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