The area of a circle is 121π . What is the circumference? You can use the π symbol

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Duane Bryant answered
Area of circle = pi x radius squared  circumference = 2 x diameter  diameter = 2 x radius.  Radius = Square root of (Area/pi) since area is already expressed in terms of pi, take the square root of 121 to find the radius, double that to find the diameter and multiply that by pi to find the circumference.

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