The word classism means the prejudice or discrimination against those who are poor or rich. Classism is a very bad thing and companies and the government generally cannot engage in classism.
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"exactly straight"
The quotation is exactly as in the original.
If angles are congruent they are exactly the same.
If you mean "Does the sum of two angles equal exactly 90 degrees?" it is yes.
Identical means exactly the same:ʌɪˈdɛntɪk(ə)l/adjectiveadjective: identical1. similar in every detail; exactly alike.