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$\frac{1}{2}.a.d.\sin \left(A\right)+\frac{1}{2}.b.c.\sin \left(C\right)$

Millimeter (mm) Centimeter (cm) Decimeter (dm) Meter (m) Decameter (dam) Hectometer (hm) Kilometer (km)

$\frac{1}{2}.a.d.\sin \left(A\right)+\frac{1}{2}.b.c.\sin \left(\mathrm{C\; (cm²)}\right)$
= $\frac{1}{2}.3.6.\sin \left(\mathrm{110}\right)+\frac{1}{2}.5.2.\sin \left(\mathrm{80\; (cm²)}\right)$
= $\mathrm{8,4573\; +\; 4,924\; (cm²)}$
= 13,3813 (cm²)