The Triangle Inequality Theorem is a very important rule that helps us figure out if three lengths can make a triangle. It says that if you take any three sides, the total length of any two sides must be greater than the length of the third side. This theorem is used in many different areas, like engineering, architecture, and computer graphics, where it is really important to understand how things are positioned in space.
For example, when designing structures, it's essential to make sure that the supports can form triangles, as this provides strength and stability. Additionally, this theorem can also help solve routing problems in network design, making sure that connections between points are efficient and work well.