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∣a∣ = √ax² + ay²
∣a∣ = √(8² + 6²) = √(64 + 36) = √100
∣a∣ = 10 cm
arah vektor
tan ∝ = ay / ax
tan ∝ = 6/8 = 3/4
∝ = arc tan 3/4
∝ = 37°
jadi vektor a = 10 cm dgn arah 37° dari sumbu x positif