What is the length of stack e f with bar on top when fg = 10 cm, bc = 8 cm, and ab = 9 cm? round to the nearest tenth of a centimeter.

Hello! Lets solve this step by step! :)
Okay so we are ganna use the Pythagorean theorem.
Since we know that FG = 10 cm, BC = 8 cm, and AB = 9 cm, we can now plug those numbers into our equation. So we take  8 squared + 9 squared = c squared
 So thats 81+64=c^2 145=c^2
 and √145 =12.0415945788
Now we round it to the nearest tenth of a centimeter and that gives us 12.04  So thats our answer! :)
Hope this helped if you have any other questions or would like further explanation just let me know!! :)