Answer:
18.1 cm
Step-by-step explanation:
Work out CD
[tex]\sqrt{16^{2}-7^{2} } = 14.38749457[/tex] ⇒ Pythagoras Theorem
Use CD and AD to work out AC
[tex]\sqrt{14.38749457^{2}+11^{2} } = 18.11077028[/tex] ⇒ Pythagoras Theorem
