Based on your description of a small triangle inside a bigger triangle, the statement that could be proved with the help of the figure is:
A line connecting the midpoints of two sides of a triangle is parallel to the third side and half its length.
This statement relates directly to the geometric properties of triangles and can be visually demonstrated with a figure showing a smaller triangle formed by the midpoints of the sides of a larger triangle. The other statements, while true, would not necessarily be illustrated or proven through just a small triangle inside a bigger triangle.