Question

A triangle has side lengths of 18 & 13. Which of the following could not be a measure of the third side?
1) 4
2) 5
3) 22
4) 30

Answer 1

The first and second, both cannot be, as:

\(\Large \color{purple}{\rightarrow 13 + 4 < 18 }\)

and

\(\Large \color{purple}{\rightarrow 13 + 5 \le 18 }\)

Answer 2

We know that:

\(\Large \color{purple}{\rightarrow a + b > c }\)

Answer 3

30