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AB = √(16+64) = √80 = 4√5
AC =√(256+64) = √320 = 8√5
BC = √144 =12
l=12+12√5
d)
AB = √(3²+(-1)²) = √10
AC = √(3²+(-6)²) = √45 =3√5
BC = √25 = 5
l= 5+3√5+√10
Pozdrawiam! :)