The triangle \( \triangle XYZ \) formed by the intersection of medians with the sides of the medial triangle has an area equal to \( \frac{1}{16} \) of the area of \( \triangle ABC \).
\[ \text{Area of } \triangle XYZ = \frac{1}{16} \times \text{Area of } \triangle ABC = \frac{1}{16} \times 1440 = 90 \, \text{cm}^2 \]