Answer
$$356{\text{ c}}{{\text{m}}^2}$$
Work Step by Step
$$\eqalign{
& B = {\text{124}}.{\text{5}}^\circ ,a = {\text{3}}0.{\text{4 cm}},c = {\text{28}}.{\text{4 cm}} \cr
& {\text{Find the area of the triangle using the formula }}A = \frac{1}{2}ac\sin B \cr
& A = \frac{1}{2}\left( {{\text{3}}0.{\text{4 cm}}} \right)\left( {{\text{28}}.{\text{4 cm}}} \right)\sin \left( {{\text{124}}.{\text{5}}^\circ } \right) \cr
& {\text{Using a calculator}} \cr
& A \approx 356{\text{ c}}{{\text{m}}^2} \cr} $$
