## Task 3

Construct a square with a side length of $6 \mathrm{~cm}$. Then draw the two diagonals. Now you can see four triangles: cut them out and compare them by placing them on top of each other.

Think about how many square centimeters the area of each of the four triangles is.
The square has an area of $6 \mathrm{~cm} \cdot 6 \mathrm{~cm}=36 \mathrm{~cm}^{2}$. The four triangles are equal in area. Therefore, one triangle has an area of $9 \mathrm{~cm}^{2}$.