If is the angle between the planes a1x + b1y + c1z + d1 = 0 and a2x – McqOptions

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1.	If is the angle between the planes a₁x + b₁y + c₁z + d₁ = 0 and a₂x + b₂y + c2₁z + d₂ = 0 then cos = ( frac {a1a2.b1b2.c1c2}{ sqrt {a1^2+b1^2+c1^2} sqrt {a2^2+b2^2+c2^2 }} ).
A.	True
B.	False
Answer» C.

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