Answer:
11.7
Step-by-step explanation:
Using the cosine ratio, then
cos40° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{9}{h}[/tex]
Multiply both sides by h , the hypotenuse
h × cos40° = 9 ( divide both sides by cos40° )
h = [tex]\frac{9}{cos40}[/tex] ≈ 11.7 ( to the nearest tenth )
