What is the maximum width of the mail slot?

Step-by-step explanation:
Using Pythagoras theoram,
AC²= AB²+BC²
[tex] AC= \sqrt{ {AB}^{2} + {BC}^{2} } [/tex]
[tex] = \sqrt{ {24}^{2} + {7}^{2} } [/tex]
[tex] = \sqrt{576 + 49} = \sqrt{625} [/tex]
[tex] = 25 \: cm[/tex]