69.The distance between the parallel planes 4x-2y+4z+9 0 and8x-4y +8z+ – InterviewSolution

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1.	69.The distance between the parallel planes 4x-2y+4z+9 0 and8x-4y +8z+21 0isIS42 (d)4
Answer» d= (21/2 - 9)/√(4^2 + 2^2 +4^2) = (3/2)/√(16+4+16) = (3/2)/√36 =3/12 =1/4

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