Hello! Remember you need to write complete questions in order to get good and exact answer. Here you have missing information. I'll assume that we have a rectangle whose sides are 13cm and 10cm. Remember that a rectangle is a quadrilateral whose angles are all right angles. On the other hand, the area (A) of any rectangle is given by the product of its sides. In other words:
[tex]A=L_{1}\times L_{2} \\ \\ A:Area \\ \\ L_{1}:Side \ 1 \\ \\ L_{2}=Side \ 2 \\ \\ \\ Therefore: \\ \\ L_{1}=13cm \\ \\ L_{2}=10cm \\ \\ \\ A=13\times 10 \\ \\ \boxed{A=130cm^2}[/tex]