Find the Area $9 \pi \mathrm { mm } ^ { 2 }$

Multiple Choice

Find the area. Leave your answer in terms of pi.
-A sector with radius 3 mm and interior angle 142°

A) $9 \pi \mathrm { mm } ^ { 2 }$
B) $\frac { 71 } { 10 } \pi \mathrm { mm } ^ { 2 }$
C) $\frac { 71 } { 60 } \pi \mathrm { mm } ^ { 2 }$
D) $\frac { 71 } { 20 } \pi \mathrm { mm } ^ { 2 }$