Q. 54.5( 2 Votes )

Write the l

Answer :

Given that we need to find the length of the chord of the parabola y2 = 4ax which passes through the vertex and is inclined to axis at . The figure for the parabola is as follows:



We know that the vertex and axis of the parabola y2 = 4ax is (0, 0) and y = 0(x - axis) respectively.


We know that the equation of the straight line passing through the origin and inclines to the x - axis at an angle θ is y = tanθx.



y = 1.x


y = x.


The equation of the chord is y = x.


Substituting y = x in the equation of parabola.


x2 = 4ax


x = 4a.


y = x = 4a


The chord passes through the points (0, 0) and (4a, 4a).


We know that the distance between the two points (x1, y1) and (x2, y2) is .






The length of the chord is 4√2a units.

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