Chapter 13, Trigonometric Ratios and Functions - 13.2 Define General Angles and Use Radian Measure - 13.2 Exercises - Skill Practice - Page 863: 13

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The given angle is $\frac{26\pi}{9}$. Notice that, the angle measure is positive. Since our angle is positive, we go counterclockwise $\frac{26\pi}{9}$. We can rewrite $\frac{26\pi}{9}$ as $\hspace{3em} \frac{26\pi}{9}=2\pi+\frac{\pi}{2}+\frac{7\pi}{18}$