If two planes intersect, then they divide the space.

Two planes can have several options for location in space and, for each of them, divide it into a different number of parts.

If two planes coincide, then they divide the space into two parts.

If two planes are parallel, then they divide the entire space into three parts.

If two planes intersect (at an acute, obtuse or right angle), then they divide the space into four parts.

Answer: into four parts.



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