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The name of a straight line joining two points on the circumference of a circle is a chord.If the line passes through the the centre of the circle it is called a diameter
The circle's diameter.
a diameter
You can completely specify a circle in a plane by giving the coordinates of its center point, and the length of the radius.
The properties associated with the angles of a circle is the amount of rotation about the point of intersection of two lines in order to make one line into correspondence with the other. The arc of a circle consists of two points on the circle and all of the points on the circle lie between those two points.