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Question

If A(7,9),B(3,7) and C(3,3) are the vertices of a triangle and S(α,β),O(l,m) are its circumcentre and orthocentre respectively, then the square of the distance between P(m,α) and Q(β,l) is

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Solution

Given vertices: A(7,9),B(3,7) and C(3,3)
AB=16+256=272BC=36+100=136AC=100+36=136
AC=BC and AB2=BC2+AC2
Hence, ABC is right angled isosceles triangle with C=90
S(α,β)= Mid point of AB i.e., (5,1)
O(l,m)= Vertex C=(3,3)

P(m,α)=(3,5)Q(β,l)=(1,3)PQ2=4+64=68

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