bonsoir
[EF]² = ( 9 - 1 )² + ( 1 + 3 )² = 8 ² + 4 ² = 64 + 16 = 80
[FH]² = ( 5 - 9 )² + ( - 11 - 1 )² = ( - 4 )² + ( - 12) ² = 16 + 144 = 160
[GH]² = ( 5 - 13 )² + ( - 11 + 7 )² = ( - 8 )² + ( - 4 )² = 64 + 16 = 80
{EG]² = ( 13 - 1 )² + ( - 7 + 3 )² = 12² + ( - 4 )² = 144 + 16 = 160
c'est un rectangle
aire = ( √80 x √160 ) = √12 800≈113.13
