Answer:
6 units
Explanation:
You want the length of the hypotenuse of a right triangle with legs 5 and √11.
Pythagorean theorem
The Pythagorean theorem tells you the relation between the legs a, b, and the hypotenuse c of a right triangle is ...
c² = a² +b²
c² = 5² +(√11)²
c² = 25 +11 = 36
c = √36 = 6
The length of the third side is 6 units.