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Sagot :

BC²=(5V3)²-(V27)²=75-27=48 donc BC=4V3 car 48=3*4²

 

aire de ABC : (V27)(4V3)/2=(3V3)(4V3)/2=36/2=18

 

perimetre 3V3+4V3+5V3=12V3

 

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