It could be an arc (a curved portion of the circumference), a chord (the straight line distance between two points) , or a wedge (the plane area bounded by two radii and an arc).
Remember the circle is a plane figure, not the curved line we draw. " A circle is bounded ... ."
A chord is a line which connects two points which lie on a circle.
a chord
A chord. ■
diameter
diameter
A chord is a line which connects two points which lie on a circle.
a chord
A chord. ■
A chord is a line segment which connects any two points on a circle.
diameter
It is a chord of which the circle's diameter is the largest.
It is the diameter of the circle
diameter
Chord
It's called a chord.
A chord
a diameter