1. Circles and Circumference
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Before identifying teach feature of the graph, let's review some important definitions about circles.
Now, consider the given diagram.
We can see that EF is a segment that intersects the circle and its two endpoints, E and F, are on the circumference. Therefore, it is a chord.
DF is a chord, since it intersects the circle and its two endpoints, D and F, are on the circumference. But DF also crosses the center N. Therefore, it is a diameter.
According to the definitions, DN is a radius, since its a segment whose endpoints are the center and a point on the circumference.