برون‌مرکزی

Eccentricity is a number that describes the shape of a conic section (a curve created by slicing a cone), indicating how much the curve deviates from being a perfect circle. It matters because this single value tells you what type of conic section you're dealing with—whether it's a circle, ellipse, parabola, or hyperbola—and how "stretched" or "open" the shape is.

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