T=82+92−2(8)(9)cos45T=\sqrt{8^2+9^2-2(8)(9)\cos45}T=82+92−2(8)(9)cos45
T=6.57KNT=6.57KNT=6.57KN
θ=sin456.57\theta= \frac {\sin 45}{6.57}θ=6.57sin45
θ=30.6°\theta= 30.6\degreeθ=30.6°
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