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Sagot :

Bonjour,

1)

a) aire FGCH = aire ABCD - (aire AEHD + aire EBGF)

                      =   x(x+y)       - (    x²           +    y²)

   

b) x(x+y)-(x²+y²) = x²+xy-x²-y² = xy-y²

2) a) aire FGCH = HC × GC = y(x-y)            

   b) y(x-y) = xy-y²

3) si x=10 et y=7

   aire FGCH = 10×7 - 7² = 70 - 49 = 21 (cm²)

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