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The center of a circle is called the origin. It is a point at one end of a radius, the other end of which defines the circumference of the circle.
The name is "chord".If the line segment happens to go through the center of the circle, thenit is also given the additional name "diameter", and no other chord in thesame circle can be longer than that one is.
It is a semi-circle
an O another name for a circle is an O and a spherical
circle