Answer: 4
Step-by-step explanation:
Use the pythagorean theorem ([tex]a^2+b^2=c^2[/tex]). A and b are the 2 legs, and c is ALWAYS the hypotenuse.
Plug in the values and solve:
[tex]a^2+b^2=c^2[/tex]
[tex]a^2+3^2=5^2[/tex]
[tex]a^2+9=25[/tex]
[tex]a^2=16[/tex]
a = 4
