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Triangles ABC and A'B'C' are similar.
Given: m' > m.
How to pronounce ' (штрих in Russian)?

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The word that you're looking for is: prime.

From Wikipedia:

"The prime symbol ( ′ ), double prime symbol ( ″ ), triple prime symbol ( ‴ ), quadruple prime symbol ( ⁗ ) etc., are used to designate units and for other purposes in mathematics, the sciences, linguistics and music."

See also here, for more examples how to use this word in sentences.

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  • Following that, I believe ABC’ will also be an acceptable way of saying it.
    – user538669
    Commented Jun 1, 2018 at 5:25

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