Q: Define the center of a circle?

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a straight line passing from side to side through the center

A semi-circle

Knowing two points on a circle does not define a unique circle, so it is impossible to find the centre of the circle as there are infinitely many centres possible.

In order to fully understand what the radius of a given circle is, you must know the diameter. The diameter is the distance across the circle through the center. The radius of a circle is half the diameter. For example, if the diameter of a circle is 8 inches, then the radius would be 4 inches.

No it's made by the circle that how they get the circle not the center.

Related questions

a straight line passing from side to side through the center

Yes. The center is the mid-point of the segment, and that's all you need to uniquely define a circle.

No. Every circle on the sphere whose center is also the center of the sphere is a great circle. If the circle's center is not also the center of the sphere, then the circle is a small circle.

A semi-circle

Knowing two points on a circle does not define a unique circle, so it is impossible to find the centre of the circle as there are infinitely many centres possible.

In order to fully understand what the radius of a given circle is, you must know the diameter. The diameter is the distance across the circle through the center. The radius of a circle is half the diameter. For example, if the diameter of a circle is 8 inches, then the radius would be 4 inches.

No it's made by the circle that how they get the circle not the center.

A RADIUS connects the center of a circle to any point on the circle.

A chord of a circle that contains the center of the circle is called the diameter.

The line from the center of a circle to a point on the circle is the radius.

The point from which the circle is drawn IS the center.

The radius is the distance between the center of a circle and a point on the circle