GED Math Practice Test

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The distance around a circle is known as its what?

  1. Center

  2. Diameter

  3. Radius

  4. Circumference

The correct answer is: Circumference

The distance around a circle is known as its circumference. This term specifically refers to the total length of the boundary of the circle. It can be calculated using the formula \(C = 2\pi r\) or \(C = \pi d\), where \(r\) is the radius and \(d\) is the diameter of the circle. The other terms refer to different aspects of a circle: the center is the point that is equidistant from all points on the circle, the diameter is a line segment that passes through the center and connects two points on the circumference, and the radius is the distance from the center to any point on the circle. Understanding these definitions helps clarify why circumference is the correct choice for this question.

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