Question

plz solve and explain it​

Answer 1

180 degree (2)

Explanation:

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Answer 2

Let the angle between the two vectors be ∅using the dot product,we knowA.B=ABcos∅

if A=(i+j),B=(j+k)

then

A.B=1×0+1×0+1×1. {coeeficient of i is 0 in. second and coeeficient of j is 0in first}

A.B=|A||B|cos∅

cos∅=A.B/|A||B|

|A|=√1^2+1^2=√2

|B|=√1^2+1^2=√2

putting these value we get

cos∅=1/√2×√2

cos∅=1/2

∅=60

Hence the angle between two Vector will be 60°

{hope it helps}