GED Math Practice Test

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What is the circumference of a circle?

  1. Distance around a circle

  2. Exact middle of a circle

  3. Radius of a circle

  4. Area of a circle

The correct answer is: Distance around a circle

The circumference of a circle is defined as the distance around it. This measurement provides a complete outline of the circle, making it an essential concept in geometry. To find the circumference, you can use the formula \(C = 2\pi r\) or \(C = \pi d\), where \(r\) is the radius and \(d\) is the diameter. This differentiates it from other properties of a circle, such as its area or diameter, making the first choice the correct and most relevant definition. Other options refer to different aspects of a circle, but they do not accurately describe the concept of circumference.

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