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1. 50 km dgn jurusan 20⁰
x : 50 cos 20⁰ = 50. (0,94) = 47 km
y : 40 sin 20⁰ = 50 (0,34) = 17 km
2. 80 km dgn jurusan 140⁰
x = 80 cos 140⁰ = 80 (-0,766) = -61,28 km
y = 80 sin 140⁰ = 80 (0,643) = 51,44 km
x = 47 + (-61,28) = -14,28
Σy = 17 + 51,44 = 68,44
S =
=
= 69,91 km
≈ 70 km