If the planes (A_1 x+B_1 y+C_1 z+D_1 )=0 and (A_2 x+B_2 y+C_2 z+D_2 – McqOptions

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1.	If the planes (A_1 x+B_1 y+C_1 z+D_1 )=0 and (A_2 x+B_2 y+C_2 z+D_2 )=0 are at right angles to each other, then which of the following is true?
A.	( frac{A_1+B_1+C_1}{A_2+B_2+C_2} )=0
B.	(A_1+A_2+B_1 +B_2+C_1+C_2 )=0
C.	(A_1+B_1+C_1=A_2 B_2 C_2 )
D.	(A_1 A_2+B_1 B_2+C_1 C_2 )=0
Answer» E.

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