By using the Pythagorean Theorem, we will see that the length of the missing side is 4 units.
How to find the length of the third side?
We need to remember the Pythagorean Theorem, the sum of the squares of the cathetus is equal to the square of the hypotenuse.
In this case, the cathetus are x and 3, and the hypotenuse is 5, then we have:
x^2 + 3^2 = 5^2
x^2 = 25 - 9 = 16
x = √16 = 4
So the length of the missing side is 4 units.
If you want to learn more about right triangles, you can read:
https://brainly.com/question/2217700
