From the image, we can observe a table with columns labeled with values related to triangles: side length ($a$), height ($h_a$), and area ($S$). Let's fill in the missing values based on the formula for the area of a triangle:

$S = \frac{1}{2} \cdot a \cdot h_a$

Table Columns:

1. $a = 6.1 \, \text{dm}$, $h_a = 5 \, \text{dm}$, Area $S = ?$: $S = \frac{1}{2} \cdot 6.1 \cdot 5 = 15.25 \, \text{dm}^2$

2. **$a = 10 \, \text{dm}$, $S = 35 \, \text{dm}^2$, (h_a =