SOLUTION: if two planes intersect, then their intersection is a what?

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Question 99284: if two planes intersect, then their intersection is a what?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
line

you can see this by folding a piece of paper

if you picture each side of the fold as a plane; then their intersection is the crease, a line