Identify two angles that are marked congruent to each other on the diagram below.

The angle ONK is congruent to angle NKO
In a diagram, congruent angles are identified by the same mark
This means that angles that have the same marks are congruent
From the diagram, we have:
Angles ONK and NKO have the same single mark
Hence, the angle ONK is congruent to angle NKO
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