Counting the squares, point B is 2 units to the right and 5 units up from point A. This describes a right triangle, and we can use the Pythagorean Theorem to find the length of AB.
[tex]\begin{gathered} AB^2=2^2+5^2 \\ AB^2=4+25 \\ AB^2=29 \\ AB=\sqrt[]{29} \\ AB=5.38516480713\ldots \\ AB\approx5.39 \end{gathered}[/tex]
The length of AB is approximately 5.39.
