The angle between two planes is equal to

1.	The angle between two planes is equal to
A.	The angle between the tangents to them from any point
B.	The angle between the normals to them from any point
C.	The angle between the lines parallel to the planes from any point
D.	None of these
Answer» C. The angle between the lines parallel to the planes from any point

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The angle between two planes is equal to

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