Question

The sum of the focal distances of a point on the ellipse $\frac{x^2}{4}+\frac{y^2}{9}=1$ is:

• A. $4$ units
• B. $6$ units
• C. $8$ units
• D. $10$ units

Answer 1

The correct option is B $6$ units

The sum of focal distances from a point of ellipse is 2 times the major axis.
For the given ellipse , length of semi major axis i.e. $b$ is $3$.
So required length $=2\times 3=6$
Option B is true