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Як обчислюється площа трикутника за координатами вузлів?
A = 0.5·|(x₂−x₁)(y₃−y₁) − (x₃−x₁)(y₂−y₁)|
A = |(x₁−x₂)(y₁−y₃)|
A = (x₁+x₂+x₃)(y₁+y₂+y₃)
A = (x₁y₁ + x₂y₂ + x₃y₃)/2
A = |(x₂−x₁)(y₃−y₂) − (x₃−x₂)(y₂−y₁)|
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