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I need help with algebra 2 homework?

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The guy Pierre way back when.The guy who first used the perpendicular sign. What was his last name?

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  1. No no no...Mariela should get negative points for that, lol.  Fermat is not the answer.  

    It IS Pierre Hérigone.  He introduced the upside down "T" to express perpendicularity in the 1600s.  


  2. fermat . . . .i think
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