Gujarati
10-2. Parabola, Ellipse, Hyperbola
easy

एक दीर्घवृत्त के नाभिलम्ब की लम्बाई दीर्घ अक्ष की $\frac{1}{3}$ है, तो इसकी उत्केन्द्रता होगी

A

$\frac{2}{3}$

B

$\sqrt {\frac{2}{3}} $

C

$\frac{{5 \times 4 \times 3}}{{{7^3}}}$

D

${\left( {\frac{3}{4}} \right)^4}$

Solution

(b) नाभिलम्ब $ = \frac{1}{3}$ (दीर्घअक्ष)

$\frac{{2{b^2}}}{a} = \frac{{2a}}{3}$

${a^2} = 3{b^2} = 3{a^2}(1 – {e^2})$

$e = \sqrt {\frac{2}{3}} $.

Standard 11
Mathematics

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