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Yes, a cord that is a diameter always passes through the center of a circle. And it's also the longest cord of that circle.
The diameter
A diameter of a circle must pass through the center of that circle. A cord is a line segment that has its endpoints on the circumference of a circle. It can be any line segment. If that cord also passes through the center of the circle, it is said to be a diameter of that circle. A diameter of a circle is the longest cord of the circle.
The cord of a circle that contains the center of that circle is a diameter of that circle.
Diameter
Not sure if it's 100% true, but when I was PAT testing at work it said that a cord had a diameter of >4mm and a cable had a diameter of <4.mm
Diameter, cord, radious.
A standard CD is 4.75 5 inches rounded in diameter.
the diameter of the hand.
A cord that passes through the center of a circle is a diameter of that circle. And you've probably guessed that this is the largest cord of that circle.
A chord is a straight line inside a circle that spans its circumference and the diameter of a circle is its largest chord.
The diameter of a standard tennis ball is approximately 6.7 cm.