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Can anyone tell me the answer of this two question

1.if a=25cm,b=13cm and c=20cm,what is the value of (s-b)?
2.name the mathematician who developed coordinate geometry?


2)Rene Descartes

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S=(a+b+c)/2 =(25+13+20)/2 =58/2 =29 S-b=29-13 =16
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