Hi there! :)
[tex]\large\boxed{b = 4}[/tex]
Use Pythagorean theorem to solve:
a² + b² = c² where "c" is the hypotenuse or the diagonal:
Plug in the given values:
(3)² + b² = (5)²
9 + b² = 25
Subtract 9 from both sides:
b² = 16
Take the square root of both side:
√b² = √16
b = 4.
