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This question does not make sense. All chords are not, in fact, diameters. Actually, only chords that pass through the center of a circle are diameters.

Q: Why are all chords diameters?

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The only chords that are diameters are the chords that go through the center of the circle. All of the other chords are shorter.

Yes, a diameter can be regarded as a special case of a chord. NB: NOT ALL CHORDS ARE DIAMETERS!

just two parallel chords!

Not unless the chords are both diameters.

By definition, diameters are lines that reach all the way across the circle, crossing the middle point. The definition of a chord is a line segment that stretches across a circle intersecting at two points that does not cross the middle point. Chords are not diameters, for the property that makes a line segment a diameter is the intersection with the middle point. If the line segment is a diameter, then it automatically means that it is not a chord, for in essence, they are opposite.

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No, all chords are not diameters, though all diameters are chords.

The only chords that are diameters are the chords that go through the center of the circle. All of the other chords are shorter.

Yes, a diameter can be regarded as a special case of a chord. NB: NOT ALL CHORDS ARE DIAMETERS!

Yes

The diameter of a circle is its largest chord

A diameter is a cord in a circle containing the center of the circle. But some circles are sections of spheres. Not all diameters are diameters of spheres.

just two parallel chords!

Not unless the chords are both diameters.

There are an infinite number of diameters to any circle...

No because the diameter of a circle is its largest chord.

By definition, diameters are lines that reach all the way across the circle, crossing the middle point. The definition of a chord is a line segment that stretches across a circle intersecting at two points that does not cross the middle point. Chords are not diameters, for the property that makes a line segment a diameter is the intersection with the middle point. If the line segment is a diameter, then it automatically means that it is not a chord, for in essence, they are opposite.

Ummm I am sort of confused what you mean, but I believe you mean other then the Diameter and Radius. There is the Chord, the Secant, and the Tangent Lines.