What is the eccentricity e of a parabola?
Answer and explanation
Correct answer: A. 1
- Step 1: By definition of conic sections, eccentricity e is the ratio of distance from focus to distance from directrix. Step 2. For a parabola, this ratio is always e = 1. Answer: 1. Why not the others: 0 is the eccentricity of a circle; less than 1 is an ellipse; greater than 1 is a hyperbola.
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