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Sagot :

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1) DEC rectangle isocele

DÊC=D^CE = 45°

2) sin45=DE/EC

DE =5*sin(5)≈3,5333=3,5cm

3) A carré = 5²=25cm²

A triangle = (3,5*3,5)/2=6,125cm²

A motif = 31,125cm²

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