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From the center to an outside part. Half the diameter
Yes it is. The radius of a circle is the length of the line from the center to any point on its edge.
A central angle.The section of the circle formed by that angle and the part of the circle (the part being the circumference) between the radii is called a sector.
A chord of a circle that contains the center of the circle is called the diameter.
This is the center of the circle. From the center of the circle, all the points on the circle are equally distant.