It need to find the decomposition to find the area of the figure


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These are the areas of the triangles added together:


3.2×3.8+3.2×1.6=3.2×5.4=17.28 sq km.

Or, you could take just two triangles and add their areas 3.2(3.8+1.6)=3.2×5.4=17.28 sq km.

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