What is the angle between the planes\[2x-y+z=6\] and\[x+y+2z=3\]?

1.	What is the angle between the planes\[2x-y+z=6\] and\[x+y+2z=3\]?
A.	\[\pi /2\]
B.	\[\pi /3\]
C.	\[\pi /4\]
D.	\[\pi /6\]
Answer» C. \[\pi /4\]

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What is the angle between the planes\[2x-y+z=6\] and\[x+y+2z=3\]?

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