bonjour
(AB)² = ( 2 - 6 )² + ( - 3 - 5 )² = ( - 4 )² + ( - 8 )² = 16 + 64 = 80
( AC)² = ( - 4 - 6 )² + ( 0 - 5 )² = ( - 10 )² + ( - 5 )² = 100 + 25 = 125
(BC)² = ( - 4 - 2 )² + ( 0 + 3 )² = ( - 6 )² + 3² = 36 + 9 = 45
80 + 45 = 125 donc il est rectangle
[( √80 ) * ( √45 ) ] : 2
= 60 : 2
= 30
aire = 30
