Evaluate the Iterated Integral $\int _ { \pi } ^ { 2 \pi } \int _ { 3 } ^ { 6 } r ^ { 4 } \sin \theta d r d \theta$

Evaluate the iterated integral $\int _ { \pi } ^ { 2 \pi } \int _ { 3 } ^ { 6 } r ^ { 4 } \sin \theta d r d \theta$