Answer :

To show the right 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

.for right angle θ=90°


Cos90°=0


(1)


(i)On comparing with standard equation





Hence proved planes at right angles.


(ii) On comparing with the standard equation of a plane





Hence proved planes at right angles.


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