In geometry, the parallel postulate, also called Euclid's fifth postulate because it is the fifth postulate in Euclid's Elements, is a distinctive axiom in Euclidean geometry. It states that, in...

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If they intersect, then at that line of intersection, they have no distance -- 0 distance -- between them. Part of your detective work is finding out if two planes are Learn if the two planes are parallel. Identify the coefficients a, b, c, and d from one plane equation. Find a point (x1, y1, z1) in the other plane.