Question

If one end of a focal chord of the parabola, y² = 16x is at (1, 4), then the length of this focal chord is:
(A) 25 (B) 24
(C) 22 (D) 20

Answer 1

If one end of a focal chord of the parabola, y² = 16x is at (1, 4), then the length of this focal chord is:

(A) 25

(B) 24

(C) 22✅

(D) 20

Answer 2

Answer:

(A) 25

Step-by-step explanation:

slope 4-0/1-4=tan thita

L=4a cosec^2 alpha = 16*25/16=25