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|AB| = √(1+3)² + (4-2)² = √16+4 = √20 = 2√5
|AC| = √(1+3)² + (8-2)² = √16+36 = √52 = 2√13
|BC| = √(-3-1)² + (8-4)² = √16+16 = √36 = 6
Wspolrzedne :
AB (-1,3)
BC (-1,6)
AC (-3,5)