The diameter of a circle could also be called the longest chord in that circle.
A chord is any straight line that connects two points on a curve. A circle has a near infinite number of chords that can be drawn between any two points around its circumference.
Any chord that passes through the middle of the circle, making it the longest chord possible in the confines of the circle, is also known as the diameter of the circle.
So, every diameter is a chord, but not every chord is a diameter.
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The longest chord of a circle is its diameter
The diameter.
The diameter
. . the chord.
diameter