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vektor AB=vektor B-vekor A = 1,1,1 (panjangnya √3)
vektor AC=vektor C--vektor A=1,0,-1 panjangnya √2)
AB.AC :
1+0-1 = √3.√2.cosα
cosα=0
α = 90 derajat
nmr 27 saya kurang bisa