I believe that is called a chord.
Yes, a chord is the straight line segment that crosses a circle, from one side of the circle to the other. The biggest possible chord is the diameter. The curved part of the circle, cut off by the chord [or chords], is the arc or the angle.
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This is a line segment called a diameter of the circle.
That line is called diameter. It divides a circle into two semi circles.
Diameter
yes half of that line is called the radius (used to calculate the area of a circle)
This is called "diameter"