Two points define a line, but if there are two lines in a plane, and if they intersect somewhere, they “define” a single point. If there are two planes in space, and they intersect, what do they define? (Look at the walls of your room, where they meet. Imagine if there were no floor or ceiling, and the walls went up and down and side to side forever. What element describes where one wall meets another wall?)

Question

Two points define a line, but if there are two lines in a plane, and if they intersect somewhere, they “define” a single point.  If there are two planes in space, and they intersect, what do they define?  (Look at the walls of your room, where they meet. Imagine if there were no floor or ceiling, and the walls went up and down and side to side forever.  What element describes where one wall meets another wall?)

MrMudd183 · Answer

Can you post more to the question like the sources and the answers please?

jhonyy9 · Answer

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hope this image will help you understanding more easy