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Which of the following is the eccentricity of a rectangular hyperbola?

Which of the following is the eccentricity of a rectangular hyperbola? Correct Answer √2

The eccentricity is defined as the ratio of the distance of the point from the focus to the distance of the point from the directrix. For the hyperbola the value of eccentricity e>1, it is defined as e = (1 + b2/a2)1/2, whereas in rectangular hyperbola a=b hence the value of eccentricity is constant and equal to √2.

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