Find the length of the third side. If necessary,
write in simplest radical
form.

Answer:
Hypotenuse^2 = Opposite^2 + Adjacent^2
Step-by-step explanation:
Here,
Hypotenuse = 4
Opposite = 3
find Adjacent side(x).
So,
Hypotenuse^2 = Opposite^2 + Adjacent^2
=> 4^2 = 3^2 + x^2
=> 16-9 = x^2
=> x^2 = 7
∴ x = √7
Hope this helps!!