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S₁x = 8 Cos 270 S₁y = 8 Sin 270
= 0 = -8
S₂= 6 km ke utara dan timur (α=30⁰)
S₂x = 6 cos 30 S₂y= 6 sin 30
= 6. 1/2√3 = 6. 1/2
= 3√3 = 3
Sx= S₁x+S₂x = 3√3
Sy = S₁y+S₂y= -5
R =√Sx²+Sy²
=√27+25
= √52
= 2√13 km