Réponses

2013-12-13T19:20:42+01:00
Bonsoir
AB = AD = 6 cm  
AM = AN = x
1)
Aire ABCD = 6² = 36 cm²
Aire MDC = ( 6(6-x) ) / 2 = ( 36-6x) / 2 = 18 - 3x 
Aire NBC = Aire MDC 
Aire AMCN = Aire ABCD - 2( aire MDC) = 36 - ( 36 - 6x) = 6x