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P=1/2*a*b*sinα
1/2*xy*sinα=2
xy*sinα=4
P=1/2*2x*y*sinα+1/2*2xz*sinβ+1/2*2yz*sinγ=4+4+4=12
P_{ABC}=12+2=14
7 · 2 = 14 [j²]