Question

I need to know the answer at least 3 decimal places

Answer 1

From the problem we have a right triangle.

Using pythagorean theorem in getting the length of AB :

$\begin{gathered} AB^2=12^2-9^2 \\ AB^2=144-81 \\ AB^2=63 \\ AB=\sqrt[]{63} \\ AB=7.937 \end{gathered}$

The length of AB is 7.937