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$\frac&space;{a}{Sin(A)}=\frac{b}{Sin(B)}=\frac&space;{c}{Sin(C)}$

The answers (with the sig fig in each number underlined):

 Number Sig Fig Number Sig Fig Number Sig Fig 4.90 3 0.00120 3 0.001060 4 56.0020 6 000200.000 6 780. 3 0.0018 2 .0018 2 1.8x10-3 2

Note that the last row shows three different ways to express the same number to the same sig fig.