bonjour
AB² = ( - 2 - 6 )² + ( 2 - 8 )² = ( - 8 )² + ( - 6 )² = 64 + 36 = 100
AB = √ 100 = 10
BC² = ( 10 + 2 )² + ( - 14 - 2 )² = 12² + ( - 16 )² = 144 + 256 = 400
BC = √ 400 = 20
AC² = ( 10 - 6 )² + ( - 14 - 8 ) ² = 4² + ( - 22 )² = 16 + 484 = 500
AC = 10 √ 5
