This table involves converting between degrees and radians. I'll walk through the conversions:

1. From Degrees to Radians:

   • Formula: $\text{radians} = \text{degrees} \times \frac{\pi}{180}$

2. From Radians to Degrees:

   • Formula: $\text{degrees} = \text{radians} \times \frac{180}{\pi}$

Let me help you with each of these conversions.

Let's go through each question step-by-step:

1. Degrees to Radians (90°)
   Using the formula:
   $\text{radians} = 90 \times \frac{\pi}{180} = \frac{\pi}{2}$

2. Degrees to Radians (45°)
   $\text{radians} = 45 \times \frac{\pi}{180} = \frac{\pi}{4}$

3. Degrees to Radians (30°)
   $\text{radians} = 30 \times \frac{\pi}{180} = \frac{\pi}{6}$

4. Radians to Degrees ($\pi$)
   $\text{degrees} = \pi \times \frac{180}{\pi} = 180°$

5. Radians to Degrees ($\frac{\pi}{3}$)
   $\text{degrees} = \frac{\pi}{3} \times \frac{180}{\pi} = 60°$

6. Radians to Degrees ($\frac{\pi}{5}$)
   $\text{degrees} = \frac{\pi}{5} \times \frac{180}{\pi} = 36°$

7. Degrees to Radians (18°)
   $\text{radians} = 18 \times \frac{\pi}{180} = \frac{\pi}{10}$

8. Degrees to Radians (12°)
   $\text{radians} = 12 \times \frac{\pi}{180} = \frac{\pi}{15}$

9. Radians to Degrees ($\frac{\pi}{9}$)
   $\text{degrees} = \frac{\pi}{9} \times \frac{180}{\pi} = 20°$

10. Radians to Degrees ($\frac{\pi}{12}$)
    $\text{degrees} = \frac{\pi}{12} \times \frac{180}{\pi} = 15°$

11. Degrees to Radians (9°)
    $\text{radians} = 9 \times \frac{\pi}{180} = \frac{\pi}{20}$

12. Radians to Degrees ($\frac{\pi}{18}$)
    $\text{degrees} = \frac{\pi}{18} \times \frac{180}{\pi} = 10°$

Would you like further explanations on any of these steps?