Jawaban:

1.A circle is a shape consisting of all points in a plane that are a certain distance from a certain point, the center; the equivalent is a curve traced by a point moving in a plane so that its distance from a given point is constant.

2.A chord of a circle is a line segment inside a circle that connects two points on the circle. The chord that passes through the center of the circle is called the diameter of the circle.

3.The diameter of a circle is 2 times the length of the radius of the circle.

4.The arc of a circle is the area of a circle bounded by two lines of radii and bounded by an arc of a circle which is flanked by the two radii.

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