March 2019 2 225 Report
QUIZ MATH - IK

Diketahui balok ABCD.EFGH dengan koordinat titik sudut A (3,0,0), C (0,√7,0), D (0,0,0), F (3,√7,4)dan H (0,0,4). Besar sudut antara vektor DH dan DF adalah ... .

(UN 2009)
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