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Sagot :

Réponse :

A = 8cm²

c=√8=2√2

A AEF= (AE*AF)/2=

[(2√2)/2*(2√2)/2])/2 =

(√2*√2)/2 = 2/2 =1cm²

A EDC =(ED*DC)/2 =

[(2√2)/2*2√2]/2=

(√2*2√2)/2 = 4/2 =2cm²

A FBC = (FB*BC)/2 = A EDC = 2cm²

A ABCD = 8cm²

A EFC = 8-1-2-2= 3cm²

Explications étape par étape

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