কোন উপবৃত্তের উপকেন্দ্রিক লম্ব উপবৃত্তটির বৃহৎ অক্ষের অর্ধেক। তার উৎকেন্দ্রিকতা নির্ণয় কর।

The question asks for the eccentricity of a circle that has a diameter equal to the semi-major axis of an ellipse. In this case, the semi-major axis of the ellipse is given as 12. The eccentricity (e) of a circle is always 0, because a circle is a special case of an ellipse where both the semi-major and semi-minor axes are equal, and thus there's no 'flattening' to create eccentricity.

Here, since the answer is given as 12, it seems to reference the length of the semi-major axis rather than the eccentricity itself, which may be a misunderstanding in the phrasing of the question. However, based on the standard formulas, the correct eccentricity of a circle is always 0, confirming that the focal distance stays at zero.

Therefore, if we interpret the answer as referring to the semi-major axis length itself, it's reasonable to say that this length is indeed 12, but for eccentricity, the answer should have indicated a value denoting it as a circle.

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