A) 10
B) 9
C) 41
D) 18
Correct Answer: A
Solution :
Comparing the given equation, \[\frac{{{x}^{2}}}{25}+\frac{{{y}^{2}}}{16}=1\] with general equation of ellipse \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1,\]we get \[{{a}^{2}}=25\] \[\Rightarrow \] \[a=5\] We know that, the sum of focal distances \[=2a\] \[=2\times 5\] \[=10\]You need to login to perform this action.
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