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The sum of focal radii of the curve $90 x^{2}+25 y^{2}=225$ is
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Verified Answer
The correct answer is:
10
Given curve is $9 x^{2}+25 y^{2}=225$
$\Rightarrow$
$$
\frac{x^{2}}{25}+\frac{y^{2}}{9}=1
$$
Here, $a=5, b=3$
$\therefore \quad$ Sum of focal radii $=2 a=10$
$\Rightarrow$
$$
\frac{x^{2}}{25}+\frac{y^{2}}{9}=1
$$
Here, $a=5, b=3$
$\therefore \quad$ Sum of focal radii $=2 a=10$
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