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tan teta = Fy/Fx
tan teta = 12/9
tan teta = 4/3
tan teta = tan 53
teta = 53
besarnya F:
F = akar(Fx^2 + Fy^2)
F = akar(9^2 + 12^2)
F = akar(81 + 144)
F = akar(225)
F = 15 N
jadi F membentuk sudut 53 derajat thd sumbu x sebesar 15 N.