What is the angle between two planes \[2x-y+z=4\] and \[x+y+2z=6?\]

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

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What is the angle between two planes \[2x-y+z=4\] and \[x+y+2z=6?\]

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