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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