Question

Help! How do you solve ?
20 points !!

Answer 1

Let the required side be x.

`{x} = \sqrt{ { (√(2))}^(2) + {(4)}^(2) } \\ = √(2 + 16) \\ = √(18) \\ = \boxed{ 3 √(2) }`

3√2 is the right answer.