A mathematical problem about vector of grade one in Senior High School Given that the module of vector a is 3, B = (1,2), and a is parallel to B. find the coordinates of A Please write down the detailed process

A parallel to B a = (λ, 2 λ)
λ^2+(2λ)^2=9
λ=3√5/5
a=(3√5/5,6√5/5)

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