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A =4
B = 3
R = √37
ditanyakan
α=?
jawab:
R² = A²+B²+2AB cosα
√37 ² = 4²+3²+2(4)(3)cosα
37 = 16+9 + 24 cosα
37 = 25 + 24 cos α
37-25 = 24 cos α
12 = 24 cos α
cos α = 12/24
cos α = 1/2
cos α = cos 60
α = 60
- Resultan
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Pembahasan (lih gb)