bonjour
[AB]² = ( - 3 - 3 )² + ( 1 - 7 )² = ( - 6 )² + ( - 6 )² = 36 + 36 = 72
[ AC]² = ( 1 - 3 )² + ( - 3 - 7 )² = ( - 2 )² + ( - 10 )² = 4 + 100 = 104
[BC]² = ( 1 + 3 )² + ( - 3 - 1 )² = 4 ² + ( - 4 )² = 16 + 16 = 32
32 + 72 = 104
le triangle est rectangle mais pas isocèle