The triangle equality theorem states that the sum of the length of any 2 sides of a triangle must be greater than the length to the third site. In other words , if a b and c are the links of the sides of a triangle , then follow the conditions must hold true

1. a + b > c

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

These conditions ensure that the triangle can be formed with the given side lengths. If any of these conditions are not true, then the sides do not form a valid triangle.