what’s the missing side length help please

Answer:
6.5
Step-by-step explanation:
[tex]a^{2} + b^{2} = c^{2}[/tex] means that the two shorter legs (a and b) squared and added together equal the hypotenuse (c) you square [tex]6^{2} + 2.5^{2} = 42.25[/tex] then find the square root of 42.25 which is 6.5