See the highlighted text in the 2nd photo, where it says $$ \triangle OAC \equiv \triangle OC'A' $$ What is meant by the symbol “$\equiv$”?
2026-04-04 20:41:18.1775335278
What is meant by the symbol “$\equiv$” in this context?
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The symbol $\equiv$ has different meanings in different contexts, but it usually refers to an equivalence relation distinct from actual equality.
In this context of plane Euclidean geometry, it seems the author is using it for the congruence relation on polygons.