Answer :

To find the angle between two planes, we simply find the angle between the normal vectors of planes. So if n1 and n2 are normal vectors and θ is the angle between both then,


(i)On comparing with the standard equation of planes in vector form




Then





(ii) On comparing with the standard equation of planes in vector form




Then





(iii) On comparing with the standard equation of planes in vector form




Then





(iv)On comparing with the standard equation of planes in vector for




Then






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