AB = √((x2-x1)²+(y2-y1)²+(z2-z1)²) =√(1²+1²+1²)=✓3
S = AB²•sin 60° = 3•√3/2 = 3√3/2
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AB = √((x2-x1)²+(y2-y1)²+(z2-z1)²) =√(1²+1²+1²)=✓3
S = AB²•sin 60° = 3•√3/2 = 3√3/2