If one end of a focal chord of the parabola, $y ^ { 2 } = 16 x$ is at $( 1,4 )$, then the length of this focal chord is (1) 24 (2) 25 (3) 22 (4) 20
If one end of a focal chord of the parabola, $y ^ { 2 } = 16 x$ is at $( 1,4 )$, then the length of this focal chord is\\
(1) 24\\
(2) 25\\
(3) 22\\
(4) 20