\sin(acb) = \frac{ab}{bc} \\ ab = \sin(acb) \times bc \\ ab = 0.4 \times 7 \\ ab = 2.8cm[/tex]
[tex] \tan(abc) = \frac{ac}{ab} \\ ac = \tan(abc) \times ab = 0.5 \times 8 \\ = 4cm[/tex]
[tex] \cos(abc) = \frac{ab}{bc} \\ bc = ab \div \cos(abc) \\ bc = 3.2 \div 0.4 = 8cm[/tex]
