Question

http://roads.advancedacademics.com/contentserver/content/roadssection/292253//right%20triangle%20abc%20with%20right%20angle%20c.%20%20leg%20cb%20=%204%20and%20hypotenuse%20ab%20=%205.png

Answer 1

Do you have to find the length of AC?

Answer 2

yes

Answer 3

Applying Pythagoras Theorem,
AC= \[\sqrt{5^{2}-4^{2}}\]
AC=3