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If you mean a line that gous from the center of a circle to the edge of the circle, that is a radius.

Q: A line segment that is only half through the circle?

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A line through a circle that does not go through the center of the circle is a secant line. A line through a circle that does go through the center is still a secant line, by the way. Compare this to a line segment that has its two endpoints on the circumference of the circle. That line segment is a cord of the circle. If that cord of the circle passes through the center of the circle, then the cord is a diameter of that circle.

A line that goes through a circle is a secant line. (Remember that a line is infinitely long.) Anyline that passes through a circle is a secant line, whether it passes through the center of the circle or not. Compare this to a line segment with endpoints on the circumference of a circle. That segment is called a cord of that circle. If the cord of a circle passes through the center of that circle, it is a diameter of that circle, which is the longest cord of the circle.

A line that goes through a circle is a secant line. (Remember that a line is infinitely long.) Anyline that passes through a circle is a secant line, whether it passes through the center of the circle or not. Compare this to a line segment with endpoints on the circumference of a circle. That segment is called a chord of that circle. If the chord of a circle passes through the center of that circle, it is a diameter of that circle, which is the longest chord of the circle.

The radius is a line segment from the center of the circle to a point on the circle. As a distance, it's half the diameter.

It is the diameter of the circle.

Related questions

A line segment drawn through the centre of a circle and having endpoints on the circumference of that circle is called the diameter. Notably, a line segement with one endpoint at the centre of the circle and one anywhere on the circumference of the circle is called the radius, and is exactly half the length of the diameter.

A line through a circle that does not go through the center of the circle is a secant line. A line through a circle that does go through the center is still a secant line, by the way. Compare this to a line segment that has its two endpoints on the circumference of the circle. That line segment is a cord of the circle. If that cord of the circle passes through the center of the circle, then the cord is a diameter of that circle.

A line that goes through a circle is a secant line. (Remember that a line is infinitely long.) Anyline that passes through a circle is a secant line, whether it passes through the center of the circle or not. Compare this to a line segment with endpoints on the circumference of a circle. That segment is called a cord of that circle. If the cord of a circle passes through the center of that circle, it is a diameter of that circle, which is the longest cord of the circle.

A line that goes through a circle is a secant line. (Remember that a line is infinitely long.) Anyline that passes through a circle is a secant line, whether it passes through the center of the circle or not. Compare this to a line segment with endpoints on the circumference of a circle. That segment is called a cord of that circle. If the cord of a circle passes through the center of that circle, it is a diameter of that circle, which is the longest cord of the circle.

A line that goes through a circle is a secant line. (Remember that a line is infinitely long.) Anyline that passes through a circle is a secant line, whether it passes through the center of the circle or not. Compare this to a line segment with endpoints on the circumference of a circle. That segment is called a chord of that circle. If the chord of a circle passes through the center of that circle, it is a diameter of that circle, which is the longest chord of the circle.

Any line that passes through a circle and touches two points on its circumference is a secant line. (Recall that a line is infinitely long.) If the line passes through the center of the circle, it is still called a secant line. Compare this to a line segment that has its endpoints on the circumference of the circle. That line segment is called the cord of the circle. If that cord passes through the center of the circle, it is a diameter of the circle, which is the longest cord of that circle.

the answer is the diameter

The only diameter would be a line segment connecting the end points of the half-circle arc.

The radius is a line segment from the center of the circle to a point on the circle. As a distance, it's half the diameter.

It is the diameter of the circle.

That particular segment is the radius of the circle, which is half of the diameter.The radiusThe line segment (distance) from the center of a circle to any point on the diameter of the circle is called the radius.radius which is half the diameter and the area of the circle is pi*radius squared.A chord of a circle is a line segment that has its endpoints on the circumference of the circle.If a line segment is drawn from the center of the circle to the circumference (or curve), it is called a radius.If a chord passes through the center of the circle, its length is the diameter (width) of the circle.Radius joins the center of the circle to any point on the circle and a chord cuts through the circle but does not pass through the center.length of a line segment joining center andany poit on a circleThis is the definition of the radius of the circle, which is equal to one-half the diameter of the circleThe radius of the circle, equal to one-half of its diameter, is any line that goes from the center of the circle to any point on the circle.The distance between the center and the edge of a circle is called the radius.The distance between the center and edge of a circle is called the radius.RadiusThe distance from the center of a circle to its outer edge is the Radius.A line drawn between the center of a circle and the edge of the circle is called the radius.Radius.Diameter is the entire distance across the circle, and radius is from the center to the edge (so 2r=D).Radius :dRadiusThe distance is known as the radius and is drawn in a straight line from the centre of the circle to the edge of the circle itself