Answer:
[tex]\frac{\sqrt{17} }{9}[/tex]
Step-by-step explanation:
a^2 +b^2 =c^2 Use pythagorean theorem
8^2 +b^2 =9^2 Substitute in your known values
b=[tex]\sqrt{17} , -\sqrt{17}[/tex]
b=[tex]\sqrt{17}[/tex] A triangle leg cannot be a negative length
[tex]\frac{\sqrt{17} }{9}[/tex] Find cosine of angle theta.