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.