A chord is a segment whose endpoints are on the circumference of a circle.
ED
Before naming a chord from the graph, let's review some important definitions about circles.
Radius: A segment whose endpoints are the center and any point on the circumference of a circle.
Chord: A segment whose endpoints are on the circumference of a circle.
Diameter: A chord that contains the center of the circle.
Secant: A line that intersects a circle in two points.
Tangent: A line in the plane of a circle that intersects the circle in exactly one point — the point of tangency.
Now, consider the given diagram. We can see that ED is a chord since its endpoints are on the circle's circumference. Since it does not contain the center, it is not a diameter.
Therefore, according to the definitions ED is a chord, but not a diameter.
