(20 POINTS)How to find it and what the answer is I need it by 1/27/2020 8:30PM

Answer:
13
Step-by-step explanation:
It's a famous "triple" for triangle lengths.
It's helpful to memorize: 5, 12, 13.
It works because of the reliable pythagorean theorem:
[tex]a^{2} + b^{2} = c^{2}[/tex]
[tex]5^{2} + 12^{2} = 13^{2}[/tex]
Answer:
The missing side length is 13
Step-by-step explanation:
Use Pythagorean Theorem
5 squared + 12 squared = x squared
25 + 144 = x squared
169 = x squared
13 = x