Solve the Problem $r = 4 + 6 \cos 3 \theta$

Multiple Choice

Solve the problem.
-Find the length of each petal of the polar curve $r = 4 + 6 \cos 3 \theta$ . Note that this means the distance from the pole to the farthest point on the petal, not the arc length.

A) 4
B) 22
C) 6
D) 10