Find the angle to intersection of the following curves :

x2 = 27y and y2 = 8x

Given:


Curves x2 = 27y ...(1)


& y2 = 8x ...(2)


Solving (1) & (2),we get,


From y2 = 8x,we get,


x


Substituting x on x2 = 27y ,


()2 = 27y


() = 27y


y4 = 1728y


y(y3 – 1728) = 0


y = 0 or (y3 – 1728) = 0


y = 0 or y



y = 0 or y = 12


Substituting y = 0 or y = 12 on x


when y = 0,


x


x = 0


when y = 12,


x


x = 18


The point of intersection of two curves (0,0) & (18,12)


First curve is x2 = 27y


Differentiating above w.r.t x,


2x= 27.



m1 ...(3)


Second curve is y2 = 8x


2y. = 8


y. = 4


m2 ...(4)


Substituting (18,12) for m1 & m2,we get,


m1



m1 ...(5)


m2



m2 ...(6)


when m1 & m2



tanθ


tanθ


tanθ


tanθ


θ = tan – 1()


θ34.69


1