Actually there are several. Equal is one, congruent another. It would depend on the context which would be the best to use.
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to be identical or equal too
No they do not, equations have equal signs.
10.
Congruency is basically a mathematical term for equality: Two congruent triangles are equal to each other regarding size, area, angles etc. But we don't say they're equal, we say they're congruent. On the other hand, we don't say 22 is congruent to 4, we say it's equal to four...
3rd grade math