Can someone explain this?

Answer:
false
Step-by-step explanation:
if the 2 shorter segments dont add up to be equal or greater to the longest segment, then its impossible for a triangle to be formed :)
Answer:
True
Step-by-step explanation:
General formulas and concepts:
Subject: Geometry
Unit: Triangular Line Segments
Definitions:
Triangle Inequality Theorem
Steps:
Use the triangle inequality theorem:
9 + 4 > 11
13 > 11 ⇒ True
9 + 11 > 4
20 > 4 ⇒ True
4 + 11 > 9
15 > 9 ⇒ True
Conclusion:
Because the 3 segments that are given satisfy the statements of the triangle inequality theorem, they can therefore form a triangle.