Which term describes the ratio describing the shape of a conic section?

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Multiple Choice

Which term describes the ratio describing the shape of a conic section?

Explanation:
Eccentricity is the number that describes how stretched a conic is. For any point on the conic, the ratio of its distance to the focus and its distance to the directrix stays constant and equals this value. This ratio determines the type: less than 1 gives an ellipse (with a circle as the special case when it’s 0), equal to 1 gives a parabola, and greater than 1 gives a hyperbola. Radius and diameter measure size, not the shape, and the focus is just a fixed point—not the ratio that defines the curve.

Eccentricity is the number that describes how stretched a conic is. For any point on the conic, the ratio of its distance to the focus and its distance to the directrix stays constant and equals this value. This ratio determines the type: less than 1 gives an ellipse (with a circle as the special case when it’s 0), equal to 1 gives a parabola, and greater than 1 gives a hyperbola. Radius and diameter measure size, not the shape, and the focus is just a fixed point—not the ratio that defines the curve.

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