What is the sum of the focal distances o...

What is the sum of the focal distances of a point of an ellipse `x^(2)/a^(2)+y^(2)/b^(2)=1`?

A

a

B

b

C

2a

D

2b

Verified by Experts

The correct Answer is:

C

By difinition of ellipse, we have
`PsS+PS' = 2a`

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