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atau :
A+B = √A²+B²+2.A.B cos α
10 = √6²+8²+2.6.8 cos α
100 = 36 + 64 + 96 cos α
100 = 100 + 96 cos α
0 = 96 cos α
cos α = 0/96
= 0 ----> α = 90°