Two planes intersect at a line. The line where they intersect pertains to both planes. In the same manner, if infinitely many planes intersect each other at the same line, then that line pertains to the infinitely many planes.
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A line. When two planes intersect, their intersection is a line.
The intersection of two distinct planes is a line. The set of common points in the line lies in both planes.
yes
Any three given points can be joined by a common plane, and any two given points can be joined by a common line and an infinite number of common planes.
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