It is a chord of which the circle's diameter is its largest chord
That is called an arc.
Only round the perimeter of the circle (not across its interior) because a segment is a part of a line or curve between two points.
It is a chord of which the circle's diameter is the largest.
A great circle is any circle on the surface of a sphere whose center is at the center of the sphere. The shortest distance between two points on the surface of a sphere is a part of the great circle that passes through them.
an arc
A circle does not have any points. The circle is completely rounded off.
an arc
The radius is always at a fixed, unchanging distance from the center of a circle to all the surrounding points.
The word diameter is a noun. It is any straight line between two points on the circumference of a circle ensuring it passes through the center of the circle.
The points are all the same distance from the center of the circle. The distance between the center and any point is the radius of the circle.
In plane geometry it is a straight line. If you want to know the shortest line between two points on a globe, it will be the intervening section or arc of the great circle route that connects the points. The great circle will be a circle that cuts the globe into exactly equal parts, like the equator.
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