Gujarati
10-2. Parabola, Ellipse, Hyperbola
easy

दीर्घवृत्त  $\frac{{{x^2}}}{{36}} + \frac{{{y^2}}}{{49}} = 1$ के नाभिलम्ब की लम्बाई होगी

A

$98/6$

B

$72/7$

C

$72/14$

D

$98/12$

Solution

(b) यहाँ ${a^2} = 36$, ${b^2} = 49$. चूँकि $b > a$,

अत: नाभिलम्ब की लम्बाई $ = \frac{{2{a^2}}}{b} = 2 \times \frac{{36}}{7} = \frac{{72}}{7}$.

Standard 11
Mathematics

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