Yes, we can prove the Triangle Inequality Theorem using simple geometry.

This theorem tells us something important about triangles.

It says that if we have a triangle with sides that are different lengths, which we call $a$, $b$, and $c$, then these three rules must always be true:

1. $a + b > c$
2. $a + c > b$
3. $b + c > a$

What these rules mean is that if we take the lengths of any two sides and add them together, the total must be bigger than the length of the third side.

This is really important because it helps us know if we can form a triangle with those side lengths.

You can see this for yourself by making a triangle and measuring the sides. It helps to prove that these rules are correct!