- Home
- Standard 11
- Mathematics
10-2. Parabola, Ellipse, Hyperbola
easy
दीर्घवृत्त $25{x^2} + 16{y^2} = 100$ की उत्केन्द्रता है
A
$\frac{5}{{14}}$
B
$\frac{4}{5}$
C
$\frac{3}{5}$
D
$\frac{2}{5}$
Solution
(c) $\frac{{{x^2}}}{4} + \frac{{{y^2}}}{{(25/4)}} = 1$ की मानक समीकरण से तुलना करने पर
$a = 2,\,\,b = 5/2$.
$\therefore b > a$, अत: ${a^2} = {b^2}(1 – {e^2})$
$4 = \frac{{25}}{4}(1 – {e^2})$
$\frac{{16}}{{25}} = 1 – {e^2}$
${e^2} = 1 – \frac{{16}}{{25}} = \frac{9}{{25}}$,
$e = \frac{3}{5}$ .
Standard 11
Mathematics