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A more likely answer is "the centre of the circle".
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[-sqrt(2), -sqrt(2)]
The diameter is just the width of a circle. If you drew a straight line threw a 2D circle all the way across that would be it. If you Multiply the radius by 2 then you will get the Diameter. Or, if you know the area of the circle you divide the area by pi (3.14).
Draw two diameters perpendicular to each other. Draw a smaller circle with the same centre such that the radius of the inner circle is 'r' and the radius of the outer circle is 'r√2.' [Or, the radius of the outer circle is R and the radius of the inner circle is R/√2.]
If the curve is part of the circumference of the circle, it is called an arc.
Intersection point in lines & in figures' sides it's called vertex.