Answer:
4.9
answer choice 3
Explanation:
There really is no need to solve this using any mathematical techniques
KJ must lie between 4 and 5.8 - it cannot be greater than 5.8
There is only one answer choice that fits and that is the third option 4.9
If you really wanted to go through the exercise, let x denote the length KJ
Then by congruence we get
x/4 = 5.8/x
Cross-multiplying we get x² = 4 x 5.8
x² = 23.2
x = √23.2 which is 4.8166
rounded up it becomes 4.9