Not sure what you mean by "in the middle of a circle".
A chord must have each of its ends on the circumference of the circle.
If a chord is such that is passes through the centre point of the circle, it is (the longest chord possible and is) called a diameter.
Or to put it another way, a diameter of a circle is a chord which passes through the centre point of the circle.
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The chord that runs through the middle of a circle is called the diameter.
all you have to do is find a line with two endpoints on the circle also a diameter is the longest chord on a circle that runs through the middle of the circle.
A chord. The diameter is technically a chord goes through the middle point.
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.
The longest chord of a circle is its diameter