Use the Pythagorean Theorem to find the length of the missing side. Then find the indicated trigonometric function of the given angle. Give an exact answer with a rational denominator.

We will have:
[tex]h=\sqrt[]{7^2+6^2}\Rightarrow h=\sqrt[]{85}[/tex]We will have then the the secant of theta will be:
[tex]\sec (\theta)=\frac{\sqrt[]{85}}{7}[/tex]So the answer is C.