Which defines a circle a. Two days with a common endpoint b. A piece of a line with two endpoints c. A piece of a line with one endpoint d. All Copland points equidistant from a given point

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Answer:

The correct answer is d.

Step-by-step explanation:

Any point that is co planar with one another and is also equidistant from a given point is a circle. We need it to be co planar, otherwise it would be 3-dimensional and create a sphere. And if they we not all equidistant, they would not make an even circle (it'd be an oval or another shape).