The angle \( \pi \) radians is equivalent to 180° in degrees. 

1. **Cosine of \( \pi \):**
   \[
   \cos(\pi) = -1
   \]

2. **Sine of \( \pi \):**
   \[
   \sin(\pi) = 0
   \]

These values come from the unit circle, where the angle \( \pi \) radians (180°) corresponds to the point (-1, 0).

Would you like more details or have any questions?

Here are 5 related questions:
1. What is the cosine and sine of \( \frac{\pi}{2} \) radians?
2. How can you find the tangent of \( \pi \) radians?
3. What are the cosine and sine of \( 2\pi \) radians?
4. How do you use the unit circle to find trigonometric values?
5. What is the cosine and sine of \( \frac{3\pi}{2} \) radians?

**Tip**: Knowing the unit circle well will help you quickly determine sine and cosine values for common angles.

Discover how to calculate the cosine and sine of the angle π radians (180°) using the unit circle. This detailed explanation covers trigonometric concepts like radians, cosine, and sine. Perfect for students in Grades 9-12 studying trigonometry.

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