Question
Question: If a double ordinate of the parabola y<sup>2</sup> = 4ax be of length 8a, then the angle between the...
If a double ordinate of the parabola y2 = 4ax be of length 8a, then the angle between the lines joining the vertex of the parabola to the ends of this double ordinate is
A
300
B
600
C
900
D
1200
Answer
900
Explanation
Solution
PQ = 8a
4at = 8a
t = 2
tan (q/2) = 2at/at2
̃ tan(q/2) = 2/t = 2/2 = 1
̃ q/2 = 450
̃ q = 900
