December 2019 1 136 Report
Pada segitiga abc dengan A(1,1,1), B(2,-1,3) dan C(3,2,-1), hasil dari |AB|AC + |AC|BC


a. 9i + 12j - 18k

b. 9i - 12j + 18k

c. 12i + 9j - 18k

d. 12i - 9j + 18k

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