alleryEccentricity of ellipse: x² + 4y² = 4:
Asqrt(3)/2 (rewrite x²/4 + y²/1 = 1; a=2, b=1, c=sqrt(3))
B1/2
Csqrt(2)
D0
Answer & Solution
Correct answer: A. sqrt(3)/2 (rewrite x²/4 + y²/1 = 1; a=2, b=1, c=sqrt(3))
x²/4 + y²/1 = 1: a² = 4, b² = 1, c² = a² - b² = 3. e = c/a = sqrt(3)/2 ≈ 0.866.
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