Question

Does it triangle? 5 feet, 9 feet, 15 feet
​

Answer 1

It is not a triangle

Explanation:

The Triangle Inequality theorem states that in a triangle,
`a+b>c`, where
`a` and
`b` are shorter side lengths and
`c` is the longest side length.

Given that
`5+9<15`, the given side lengths do not compose a valid triangle.