Final answer:
Two pentagons can coincide under one condition; they should be congruent and have the same orientation. This signifies that the pentagons are identical in every aspect.
Step-by-step explanation:
In geometry, two pentagons coincide if they overlap each other exactly. A pentagon can coincide with another pentagon in one condition, that is, when they are congruent (same size and shape), and their orientation is the same.
The significance of this one means that the two pentagons are identical in every aspect from shape, size to orientation. It's like having two perfectly matching puzzle pieces.
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