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Mathematics 16 Online
OpenStudy (anonymous):

Two planes sometimes intersect at a line. But why?

OpenStudy (aum):

|dw:1412710357857:dw| Two planes intersect along the line AB.

OpenStudy (aum):

Or the walls of a room, each wall being a plane, intersect the ceiling or the floor along straight lines.

OpenStudy (anonymous):

thank you

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