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  4. What is the length of the smallest focal chord of the parabola y2=4 a x ?

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Q. What is the length of the smallest focal chord of the parabola $y^{2}=4 a x ?$

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Solution:

The length of smallest focal chord of the parabola is its latus rectum and for parabola $y^{2}=4 a x$, it is $4 a$.