Final answer:
The length of line segment KJ is approximately 10.3 units.
Step-by-step explanation:
The length of line segment KJ can be found using the Pythagorean theorem. If KJ is the hypotenuse of a right triangle with sides of lengths 9 and 5 units, then its length can be found as follows:
KJ = √(9^2 + 5^2)
KJ = √(81 + 25)
KJ = √106
KJ ≈ 10.3 units