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Question

The radius of the circle passing through the foci of the ellipse $$\frac { { x }^{ 2 } }{ 16 } +\frac { { y }^{ 2 } }{ 9 } =1$$ and having its centre at $$\left( 0,3 \right)$$ is ___________.


A
6
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B
4
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C
3
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D
2
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Solution

The correct option is B $$4$$
$$ae=\sqrt { 7 } $$
$$r=\sqrt { { ae }^{ 2 }+{ b }^{ 2 } } $$
$$=\sqrt { 7+9 } =4$$

Mathematics

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