AB² = (3-1)² + (-1+1)² = 2² = 4
AB = √4 = 2
AC² = (3+1)² + (-1-1)² = 4² + 2² = 20
AC = √20 = 2√5
BC² = (1+1)² + (-1-1)² = 2² + 2² = 8
BC = √8 = 2√2
Периметр
Р = 2 + 2√5 + 2√2
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Answers & Comments
AB² = (3-1)² + (-1+1)² = 2² = 4
AB = √4 = 2
AC² = (3+1)² + (-1-1)² = 4² + 2² = 20
AC = √20 = 2√5
BC² = (1+1)² + (-1-1)² = 2² + 2² = 8
BC = √8 = 2√2
Периметр
Р = 2 + 2√5 + 2√2