AB = √(xb - xa)² + (yb - ya)²
AB = √ (2 - 5)² + (-1 - 3) ²
AB = √ 3² + (-4)²
AB = √ 9+16
AB = √25
AB = 5
AC = √ (xc - xa)² + (yc - ya)²
AC = √ ( 0-5)² + ( 3-3)²
AC = √ 5² + 0
AC = √25
AC = 5
BC = √ ( xc - xb)² + ( yc - ya)²
BC = √ (0 - 2)² + (3+1)²
BC = √ (-2)² + 4²
BC = √ 4 + 16
BC = √20
BC = 4
2. le triangle ABC est un triangle isocèle
voilà (✿^‿^)
