Find the Length of the Curve $x = 3 \cos t , y = 3 \sin t , 0 \leq t \leq \pi$

Multiple Choice

Find the length of the curve.
- $x = 3 \cos t , y = 3 \sin t , 0 \leq t \leq \pi$

A) $3 \pi$
B) $9 \pi$
C) $\pi$
D) $6 \pi$