Are two planes perpendicular to a third plane parallel to each other?
A. Always
B. Sometimes
C. Never

On my first go of answering this question, I immediately thought the answer was A, however, this turned out to be incorrect. Explanation needed! Thanks :)

Of course not. Place a hardback book standing up on your desktop and open the two hard covers to some arbitrary angle. The planes of the covers are each perpendicular to the desk top, but not parallel to each other (or necessarily perpendicular to each other).

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Are two planes perpendicular to a third plane parallel to each other? A. Always B. Sometimes C. Never On my first go of answering this question, I immediately thought the answer was A, however, this turned out to be incorrect. Explanation needed! Thanks :)

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Are two planes perpendicular to a third plane parallel to each other?
A. Always
B. Sometimes
C. Never

On my first go of answering this question, I immediately thought the answer was A, however, this turned out to be incorrect. Explanation needed! Thanks :)