A circle is a curve sketched out by a point moving in a plane. The circle's perimeter is the length of the line of the circle that makes the circle. It is commonly called the circumference of the circle.
A circle is a curve sketched out by a point moving in a plane so that its distance from a given point is constant; alternatively, it is the shape formed by all points in a plane that are at a set distance from a given point, the centre.
A.) The statement that contradicts this definition of the circle is that the given point should be at the circle's centre.
B.) An example of an undefined term is the perimeter of the circle,
The circle's perimeter is the length of the line of the circle that makes the circle. It is commonly called the circumference of the circle.
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